Year	Percent
1973-01-01	6.614269999999999
1974-01-01	7.259610000000000
1975-01-01	10.166700000000000
1976-01-01	12.934600000000000
1977-01-01	15.417800000000000
1978-01-01	18.235800000000000
1979-01-01	17.229800000000000
1980-01-01	15.479100000000000
1981-01-01	16.668900000000000
1982-01-01	20.053400000000000
1983-01-01	23.151900000000000
1984-01-01	23.953700000000000
1985-01-01	24.463500000000000
1986-01-01	32.180900000000000
1987-01-01	31.550800000000000
1988-01-01	33.625500000000000
1989-01-01	31.673900000000000
1990-01-01	25.798500000000000
1991-01-01	26.659200000000000
1992-01-01	27.218600000000000
1993-01-01	28.394600000000000
1994-01-01	28.811400000000000
1995-01-01	29.021500000000000
1996-01-01	28.910600000000000
1997-01-01	30.180600000000000
1998-01-01	35.679600000000000
1999-01-01	34.945300000000000
2000-01-01	30.153900000000000
2001-01-01	32.995400000000000
2002-01-01	34.235200000000000
2003-01-01	34.022400000000000
2004-01-01	34.065200000000000
2005-01-01	37.309900000000000
2006-01-01	47.286900000000000
2007-01-01	48.378000000000000
2008-01-01	58.518600000000000
2009-01-01	83.540600000000000
2010-01-01	73.890800000000000
2011-01-01	62.264800000000000
2012-01-01	59.927000000000000
2013-01-01	58.997200000000000
2014-01-01	61.403800000000000
2015-01-01	76.551000000000000
2016-01-01	83.494000000000000