Year	Percent
1979-01-01	35.322700000000000
1980-01-01	62.611000000000004
1981-01-01	73.626200000000000
1982-01-01	58.120200000000000
1983-01-01	72.023900000000000
1984-01-01	21.049400000000000
1985-01-01	16.374800000000000
1986-01-01	26.961300000000000
1987-01-01	45.143700000000000
1988-01-01	25.474800000000000
1989-01-01	58.607900000000000
1990-01-01	64.766000000000000
1991-01-01	78.065700000000000
1992-01-01	61.816900000000000
1993-01-01	75.676400000000000
1994-01-01	61.066300000000000
1995-01-01	25.197300000000000
1996-01-01	22.813500000000000
1997-01-01	34.713500000000000
1998-01-01	33.585600000000000
1999-01-01	41.070000000000000
2000-01-01	43.252200000000000
2001-01-01	24.441999999999997
2002-01-01	23.829100000000000
2003-01-01	31.049000000000000
2004-01-01	37.034900000000000
2005-01-01	39.732600000000000
2006-01-01	43.941300000000000
2007-01-01	48.772100000000000
2008-01-01	50.207300000000000
2009-01-01	55.687300000000000
2010-01-01	51.073100000000000
2011-01-01	38.508700000000000
2012-01-01	32.937600000000000
2013-01-01	29.520500000000000
2014-01-01	23.356600000000000
2015-01-01	26.341500000000000
2016-01-01	22.525600000000000
2017-01-01	30.058500000000000