Year	Percent
1973-01-01	52.380800000000000
1974-01-01	67.670400000000000
1975-01-01	84.728400000000000
1976-01-01	72.884000000000000
1977-01-01	68.131000000000000
1978-01-01	66.292300000000000
1979-01-01	62.770300000000000
1980-01-01	61.880600000000000
1981-01-01	61.602700000000000
1982-01-01	60.525200000000000
1983-01-01	62.686100000000000
1984-01-01	60.302200000000000
1985-01-01	62.634800000000000
1986-01-01	64.984300000000000
1987-01-01	66.621900000000000
1988-01-01	82.030800000000000
1989-01-01	97.224900000000000
1990-01-01	101.951000000000010
1991-01-01	112.532999999999990
1992-01-01	112.700000000000000
1993-01-01	124.501000000000000
1994-01-01	128.249000000000000
1995-01-01	116.253999999999990
1996-01-01	129.334000000000000
1997-01-01	141.097999999999980
1998-01-01	144.579000000000000
1999-01-01	152.364000000000000
2000-01-01	158.891000000000000
2001-01-01	163.005000000000000
2002-01-01	96.425300000000000
2003-01-01	97.362500000000000
2004-01-01	95.991000000000000
2005-01-01	136.565000000000000
2006-01-01	178.521000000000000
2007-01-01	187.027000000000020
2008-01-01	106.029000000000000
2009-01-01	21.743300000000000
2010-01-01	23.348500000000000
2011-01-01	24.651999999999997
2012-01-01	30.198000000000000
2013-01-01	32.882300000000000
2014-01-01	28.339000000000002
2015-01-01	22.283900000000000
2016-01-01	18.044700000000000