Year	Percent
1980-01-01	1.7075700000000000
1981-01-01	2.1090500000000000
1982-01-01	2.4506099999999997
1983-01-01	3.1369500000000000
1984-01-01	4.4934300000000000
1985-01-01	7.5307600000000010
1986-01-01	9.1729300000000010
1987-01-01	9.5089399999999990
1988-01-01	10.3519000000000000
1989-01-01	11.7333000000000000
1990-01-01	12.6197000000000000
1991-01-01	17.1672000000000000
1992-01-01	16.4956000000000000
1993-01-01	22.1329000000000000
1994-01-01	24.8052000000000000
1995-01-01	26.0783000000000000
1996-01-01	28.2849000000000000
1997-01-01	32.3428000000000000
1998-01-01	34.1906000000000000
1999-01-01	32.7036000000000000
2000-01-01	37.1266000000000000
2001-01-01	40.4985000000000000
2002-01-01	47.2223000000000000
2003-01-01	48.5977000000000000
2004-01-01	48.4334000000000000
2005-01-01	44.7064000000000000
2006-01-01	53.9844000000000000
2007-01-01	61.2807000000000000
2008-01-01	61.7728000000000000
2009-01-01	79.9514000000000000
2010-01-01	83.3334000000000000
2011-01-01	67.3429000000000000
2012-01-01	69.2055000000000000
2013-01-01	72.0169000000000000
2014-01-01	57.3158000000000000
2015-01-01	64.1696000000000000
2016-01-01	62.9506000000000000