year month average 1980 1 338.55 1980 2 339.27 1980 3 339.6 1980 4 340 1980 5 340.43 1980 6 339.99 1980 7 338.44 1980 8 337.21 1980 9 337.05 1980 10 337.82 1980 11 338.93 1980 12 339.64 1981 1 340.18 1981 2 340.74 1981 3 341.38 1981 4 341.68 1981 5 341.43 1981 6 340.62 1981 7 339.22 1981 8 338.06 1981 9 337.97 1981 10 339.07 1981 11 340.17 1981 12 340.74 1982 1 341.37 1982 2 341.95 1982 3 342.23 1982 4 342.52 1982 5 342.36 1982 6 341.49 1982 7 339.75 1982 8 338.11 1982 9 338.16 1982 10 339.62 1982 11 340.95 1982 12 341.77 1983 1 342.37 1983 2 342.74 1983 3 343.03 1983 4 343.51 1983 5 343.84 1983 6 343.5 1983 7 342.15 1983 8 340.63 1983 9 340.54 1983 10 341.75 1983 11 342.82 1983 12 343.49 1984 1 344.32 1984 2 344.83 1984 3 344.96 1984 4 345.19 1984 5 345.34 1984 6 344.57 1984 7 343.2 1984 8 342.21 1984 9 342.13 1984 10 342.99 1984 11 344.16 1984 12 345.01 1985 1 345.36 1985 2 345.81 1985 3 346.65 1985 4 346.94 1985 5 346.78 1985 6 346.28 1985 7 344.93 1985 8 343.42 1985 9 343.37 1985 10 344.65 1985 11 345.79 1985 12 346.55 1986 1 347.11 1986 2 347.33 1986 3 347.71 1986 4 348.22 1986 5 348.31 1986 6 347.75 1986 7 346.3 1986 8 344.91 1986 9 344.85 1986 10 346.03 1986 11 347.29 1986 12 347.75 1987 1 348 1987 2 348.55 1987 3 349.27 1987 4 349.96 1987 5 350.23 1987 6 349.46 1987 7 347.89 1987 8 346.65 1987 9 346.69 1987 10 347.96 1987 11 349.24 1987 12 350.19 1988 1 350.91 1988 2 351.47 1988 3 351.85 1988 4 352.3 1988 5 352.46 1988 6 351.76 1988 7 350.28 1988 8 349.09 1988 9 349.27 1988 10 350.44 1988 11 351.61 1988 12 352.46 1989 1 353 1989 2 353.45 1989 3 354 1989 4 354.38 1989 5 354.19 1989 6 353.26 1989 7 351.56 1989 8 350.21 1989 9 350.56 1989 10 351.85 1989 11 353.03 1989 12 353.9 1990 1 354.45 1990 2 354.87 1990 3 355.19 1990 4 355.5 1990 5 355.39 1990 6 354.31 1990 7 352.7 1990 8 351.6 1990 9 351.8 1990 10 353.18 1990 11 354.44 1990 12 355.18 1991 1 355.74 1991 2 356.17 1991 3 356.69 1991 4 357.21 1991 5 357.1 1991 6 356.17 1991 7 354.52 1991 8 353.03 1991 9 352.9 1991 10 354.02 1991 11 355.15 1991 12 355.95 1992 1 356.53 1992 2 356.89 1992 3 357.27 1992 4 357.76 1992 5 357.84 1992 6 356.88 1992 7 355.17 1992 8 353.67 1992 9 353.6 1992 10 354.81 1992 11 355.99 1992 12 356.75 1993 1 357.2 1993 2 357.55 1993 3 357.96 1993 4 358.41 1993 5 358.37 1993 6 357.35 1993 7 355.73 1993 8 354.44 1993 9 354.47 1993 10 355.7 1993 11 356.95 1993 12 357.86 1994 1 358.48 1994 2 359.02 1994 3 359.36 1994 4 359.71 1994 5 359.74 1994 6 358.81 1994 7 357.28 1994 8 356.05 1994 9 356.01 1994 10 357.26 1994 11 358.69 1994 12 359.55 1995 1 360.15 1995 2 360.63 1995 3 361.09 1995 4 361.56 1995 5 361.47 1995 6 360.61 1995 7 359 1995 8 357.73 1995 9 358.06 1995 10 359.43 1995 11 360.77 1995 12 361.65 1996 1 362.14 1996 2 362.5 1996 3 362.82 1996 4 363.14 1996 5 363.29 1996 6 362.88 1996 7 361.57 1996 8 360.06 1996 9 359.7 1996 10 360.67 1996 11 361.78 1996 12 362.64 1997 1 363.28 1997 2 363.65 1997 3 364.03 1997 4 364.5 1997 5 364.51 1997 6 363.6 1997 7 361.93 1997 8 360.41 1997 9 360.41 1997 10 361.94 1997 11 363.61 1997 12 364.68 1998 1 365.19 1998 2 365.46 1998 3 365.93 1998 4 366.58 1998 5 366.86 1998 6 366.27 1998 7 364.84 1998 8 363.79 1998 9 364.04 1998 10 365.34 1998 11 366.6 1998 12 367.47 1999 1 368.12 1999 2 368.52 1999 3 368.91 1999 4 369.3 1999 5 369.21 1999 6 368.36 1999 7 366.69 1999 8 365.33 1999 9 365.44 1999 10 366.75 1999 11 368.05 1999 12 368.88 2000 1 369.41 2000 2 369.68 2000 3 370 2000 4 370.37 2000 5 370.25 2000 6 369.31 2000 7 367.91 2000 8 366.75 2000 9 366.7 2000 10 367.92 2000 11 369.29 2000 12 370.12 2001 1 370.69 2001 2 371.18 2001 3 371.59 2001 4 371.91 2001 5 371.81 2001 6 370.85 2001 7 369.45 2001 8 368.32 2001 9 368.36 2001 10 369.72 2001 11 371.05 2001 12 371.96 2002 1 372.53 2002 2 372.92 2002 3 373.37 2002 4 373.72 2002 5 373.7 2002 6 372.84 2002 7 371.41 2002 8 370.37 2002 9 370.69 2002 10 371.96 2002 11 373.29 2002 12 374.27 2003 1 374.95 2003 2 375.47 2003 3 375.92 2003 4 376.39 2003 5 376.51 2003 6 375.68 2003 7 374.16 2003 8 372.93 2003 9 373.11 2003 10 374.39 2003 11 375.68 2003 12 376.53 2004 1 377.21 2004 2 377.73 2004 3 378.15 2004 4 378.47 2004 5 378.4 2004 6 377.51 2004 7 375.97 2004 8 374.5 2004 9 374.39 2004 10 375.73 2004 11 377.2 2004 12 378.17 2005 1 378.73 2005 2 379.19 2005 3 379.82 2005 4 380.3 2005 5 380.43 2005 6 379.61 2005 7 377.95 2005 8 376.73 2005 9 376.77 2005 10 378.09 2005 11 379.54 2005 12 380.52 2006 1 381.32 2006 2 381.94 2006 3 382.32 2006 4 382.65 2006 5 382.61 2006 6 381.75 2006 7 380.07 2006 8 378.49 2006 9 378.61 2006 10 380.04 2006 11 381.41 2006 12 382.38 2007 1 383.03 2007 2 383.54 2007 3 384.01 2007 4 384.27 2007 5 384.12 2007 6 383.26 2007 7 381.55 2007 8 380.3 2007 9 380.69 2007 10 382.1 2007 11 383.45 2007 12 384.46 2008 1 385.22 2008 2 385.74 2008 3 386.15 2008 4 386.54 2008 5 386.49 2008 6 385.57 2008 7 384.08 2008 8 382.76 2008 9 382.54 2008 10 383.67 2008 11 385.17 2008 12 386.27 2009 1 387.03 2009 2 387.48 2009 3 387.71 2009 4 387.99 2009 5 387.95 2009 6 386.96 2009 7 385.01 2009 8 383.63 2009 9 383.93 2009 10 385.49 2009 11 386.94 2009 12 387.84 2010 1 388.62 2010 2 389.33 2010 3 389.68 2010 4 389.98 2010 5 389.95 2010 6 389.01 2010 7 387.35 2010 8 386.23 2010 9 386.7 2010 10 388.25 2010 11 389.62 2010 12 390.37 2011 1 390.93 2011 2 391.36 2011 3 391.67 2011 4 392.05 2011 5 392.08 2011 6 391.13 2011 7 389.19 2011 8 387.86 2011 9 388.26 2011 10 389.83 2011 11 391.21 2011 12 392.04 2012 1 392.61 2012 2 393.21 2012 3 393.73 2012 4 393.99 2012 5 393.88 2012 6 392.85 2012 7 391 2012 8 389.88 2012 9 390.56 2012 10 392.16 2012 11 393.57 2012 12 394.39 2013 1 395.07 2013 2 395.69 2013 3 396.29 2013 4 396.74 2013 5 396.75 2013 6 395.96 2013 7 394.47 2013 8 393.23 2013 9 393.21 2013 10 394.5 2013 11 395.96 2013 12 396.87 2014 1 397.51 2014 2 397.97 2014 3 398.27 2014 4 398.63 2014 5 398.69 2014 6 397.73 2014 7 396.13 2014 8 395.02 2014 9 395.12 2014 10 396.38 2014 11 397.86 2014 12 398.84 2015 1 399.56 2015 2 400.12 2015 3 400.56 2015 4 400.96 2015 5 400.9 2015 6 400.06 2015 7 398.39 2015 8 397.07 2015 9 397.34 2015 10 398.8 2015 11 400.36 2015 12 401.66 2016 1 402.64 2016 2 403.27 2016 3 403.86 2016 4 404.39 2016 5 404.45 2016 6 403.66 2016 7 402.11 2016 8 400.8 2016 9 400.99 2016 10 402.42 2016 11 403.78 2016 12 404.69 2017 1 405.33 2017 2 405.91 2017 3 406.32 2017 4 406.61 2017 5 406.65 2017 6 405.86 2017 7 404.11 2017 8 402.57 2017 9 402.66 2017 10 404.16 2017 11 405.7 2017 12 406.75 2018 1 407.56 2018 2 408.24 2018 3 408.76 2018 4 409.08 2018 5 408.98 2018 6 408.09 2018 7 406.47 2018 8 405.1 2018 9 405.17 2018 10 406.65 2018 11 408.13 2018 12 409.18 2019 1 409.92 2019 2 410.34 2019 3 410.89 2019 4 411.33 2019 5 411.34 2019 6 410.53 2019 7 408.88 2019 8 407.65 2019 9 407.92 2019 10 409.44 2019 11 410.87 2019 12 411.76 2020 1 412.43 2020 2 412.95 2020 3 413.44 2020 4 413.86 2020 5 413.81 2020 6 412.88 2020 7 411.17 2020 8 409.73 2020 9 410 2020 10 411.67 2020 11 413.25 2020 12 414.14 2021 1 414.79 2021 2 415.3 2021 3 415.63 2021 4 415.93 2021 5 416.22 2021 6 415.48