Year Percent 1960-01-01 42.24520000000000 1961-01-01 44.50670000000000 1962-01-01 48.62380000000000 1963-01-01 51.53380000000000 1964-01-01 54.45090000000000 1965-01-01 57.65420000000000 1966-01-01 60.25400000000000 1967-01-01 62.64170000000000 1968-01-01 64.20130000000000 1969-01-01 65.96900000000000 1970-01-01 68.02120000000000 1971-01-01 68.66210000000000 1972-01-01 69.60300000000001 1973-01-01 73.61860000000000 1974-01-01 77.68990000000000 1975-01-01 78.91000000000000 1976-01-01 80.21960000000000 1977-01-01 86.08810000000000 1978-01-01 94.21350000000000 1979-01-01 99.26870000000000 1980-01-01 102.80100000000000 1981-01-01 103.49500000000000 1982-01-01 100.59200000000001 1983-01-01 98.70770000000000 1984-01-01 96.84650000000000 1985-01-01 94.19480000000000 1986-01-01 93.83920000000000 1987-01-01 96.69630000000000 1988-01-01 105.79799999999999 1989-01-01 110.21400000000000 1990-01-01 107.86100000000000 1991-01-01 108.90299999999999 1992-01-01 110.25000000000000 1993-01-01 110.68500000000000 1994-01-01 115.25100000000000 1995-01-01 122.77900000000000 1996-01-01 129.21300000000000 1997-01-01 136.00000000000000 1998-01-01 136.00000000000000 1999-01-01 140.63200000000000 2000-01-01 145.26500000000000 2001-01-01 145.33600000000000 2002-01-01 144.40800000000000 2003-01-01 138.08300000000000 2004-01-01 135.20500000000000 2005-01-01 131.88600000000000 2006-01-01 123.47300000000000 2007-01-01 122.85100000000000 2008-01-01 122.75000000000000 2009-01-01 120.88400000000000 2010-01-01 119.92800000000000 2011-01-01 117.91600000000000 2012-01-01 119.22100000000000 2013-01-01 120.90100000000001 2014-01-01 117.38100000000000 2015-01-01 113.05400000000000 2016-01-01 114.04299999999999