Year Percent 1960-01-01 197.69700000000000 1961-01-01 165.93400000000003 1962-01-01 144.52400000000000 1963-01-01 152.60200000000000 1964-01-01 150.36200000000000 1965-01-01 142.35700000000000 1966-01-01 134.77700000000002 1967-01-01 134.12300000000000 1968-01-01 130.59100000000000 1969-01-01 131.71900000000000 1970-01-01 102.25100000000000 1971-01-01 77.12840000000000 1972-01-01 72.76890000000000 1973-01-01 73.77500000000000 1974-01-01 75.32740000000000 1975-01-01 79.49090000000000 1976-01-01 85.24110000000000 1977-01-01 87.02440000000000 1978-01-01 97.21150000000000 1979-01-01 112.74200000000000 1980-01-01 103.85300000000000 1981-01-01 95.68840000000000 1982-01-01 88.65590000000000 1983-01-01 92.21890000000000 1984-01-01 90.81310000000000 1985-01-01 82.22460000000000 1986-01-01 79.88160000000000 1987-01-01 78.77510000000000 1988-01-01 74.36390000000000 1989-01-01 70.33640000000000 1990-01-01 75.59430000000000 1991-01-01 75.54390000000000 1992-01-01 71.48780000000000 1993-01-01 76.39370000000000 1994-01-01 67.14100000000000 1995-01-01 59.08510000000000 1996-01-01 64.82770000000000 1997-01-01 71.31290000000000 1998-01-01 69.20190000000000 1999-01-01 53.02550000000000 2000-01-01 49.58640000000000 2001-01-01 44.68850000000000 2002-01-01 37.11720000000000 2003-01-01 41.22240000000000 2004-01-01 48.98090000000000 2005-01-01 56.52790000000000 2006-01-01 62.83230000000000 2007-01-01 69.27700000000000 2008-01-01 71.80360000000000 2009-01-01 71.55970000000000 2010-01-01 78.58570000000000 2011-01-01 92.37110000000000 2012-01-01 103.89700000000000 2013-01-01 114.48400000000000 2014-01-01 124.27300000000000 2015-01-01 130.37400000000000 2016-01-01 131.53000000000000