Year	Percent
1980-01-01	7.4049600000000010
1981-01-01	7.5214300000000005
1982-01-01	8.0592800000000010
1983-01-01	8.3840200000000000
1984-01-01	8.8156000000000000
1985-01-01	10.2119000000000000
1986-01-01	12.4748000000000000
1987-01-01	15.7156000000000000
1988-01-01	16.4142000000000000
1989-01-01	16.0946000000000000
1990-01-01	12.8941000000000000
1991-01-01	11.6338000000000000
1992-01-01	8.9916900000000000
1993-01-01	7.9672899999999990
1994-01-01	7.2445200000000000
1995-01-01	6.0098500000000000
1996-01-01	7.3610800000000000
1997-01-01	11.2945000000000000
1998-01-01	17.3840000000000000
1999-01-01	18.0492000000000000
2000-01-01	21.1908000000000000
2001-01-01	21.7522000000000000
2002-01-01	23.1757000000000000
2003-01-01	26.7955000000000000
2004-01-01	28.1942000000000000
2005-01-01	24.9395000000000000
2006-01-01	31.5046000000000000
2007-01-01	34.8472000000000000
2008-01-01	35.3206000000000000
2009-01-01	46.6147000000000000
2010-01-01	45.9358000000000000
2011-01-01	46.7322000000000000
2012-01-01	51.5178000000000000
2013-01-01	53.7291000000000000
2014-01-01	51.4139999999999940
2015-01-01	60.2432000000000000