Year Percent 1960-01-01 38.21240000000000 1961-01-01 37.89570000000000 1962-01-01 38.58670000000000 1963-01-01 38.99230000000000 1964-01-01 38.20070000000000 1965-01-01 38.21610000000000 1966-01-01 38.85080000000000 1967-01-01 39.06570000000000 1968-01-01 39.60320000000000 1969-01-01 41.92870000000000 1970-01-01 42.90160000000000 1971-01-01 43.22780000000000 1972-01-01 44.01010000000000 1973-01-01 44.37680000000000 1974-01-01 42.52890000000000 1975-01-01 42.84470000000000 1976-01-01 42.85080000000000 1977-01-01 43.80340000000000 1978-01-01 43.77570000000000 1979-01-01 43.76390000000000 1980-01-01 42.51080000000000 1981-01-01 42.55040000000000 1982-01-01 42.12920000000000 1983-01-01 42.79320000000000 1984-01-01 42.18600000000001 1985-01-01 41.67390000000000 1986-01-01 42.52650000000000 1987-01-01 45.04480000000000 1988-01-01 44.81340000000000 1989-01-01 44.66940000000000 1990-01-01 45.03590000000000 1991-01-01 44.97460000000000 1992-01-01 58.46730000000000 1993-01-01 74.75810000000000 1994-01-01 75.21610000000000 1995-01-01 75.22160000000000 1996-01-01 79.08690000000000 1997-01-01 81.47930000000000 1998-01-01 81.47930000000000 1999-01-01 81.47930000000000 2000-01-01 88.12210000000000 2001-01-01 91.83350000000000 2002-01-01 92.69570000000000 2003-01-01 97.33760000000000 2004-01-01 101.31600000000000 2005-01-01 106.70299999999999 2006-01-01 108.30900000000000 2007-01-01 109.01500000000000 2008-01-01 112.95800000000000 2009-01-01 113.71900000000000 2010-01-01 111.24000000000000 2011-01-01 110.37899999999999 2012-01-01 111.96200000000000 2013-01-01 115.84500000000000 2014-01-01 119.34299999999999 2015-01-01 123.78200000000001 2016-01-01 125.34600000000000