Year	Percent
1980-01-01	0.1688430000000000
1981-01-01	0.8244100000000001
1982-01-01	0.7908320000000000
1983-01-01	0.8160640000000000
1984-01-01	0.7991410000000000
1985-01-01	0.7554440000000000
1986-01-01	0.7493340000000001
1987-01-01	1.4045500000000000
1988-01-01	2.4374400000000000
1989-01-01	2.6766700000000000
1990-01-01	2.7395400000000003
1991-01-01	1.2796500000000000
1992-01-01	1.0829100000000000
1993-01-01	1.1096600000000000
1994-01-01	5.0027800000000004
1995-01-01	3.7492699999999997
1996-01-01	3.6554300000000004
1997-01-01	2.4875800000000000
1998-01-01	2.1210500000000000
1999-01-01	1.5612000000000000
2000-01-01	1.4106700000000000
2001-01-01	2.6372800000000000
2002-01-01	2.0462200000000000
2003-01-01	2.8875700000000000
2004-01-01	2.5548900000000003
2005-01-01	2.2326500000000000
2006-01-01	2.5038900000000000
2007-01-01	4.0126200000000000
2008-01-01	6.1105800000000010
2009-01-01	6.2714300000000005
2010-01-01	6.6193500000000000
2011-01-01	7.3678100000000000
2012-01-01	6.6273600000000000
2013-01-01	6.8062100000000010
2014-01-01	8.2639400000000000
2015-01-01	10.1726000000000000
2016-01-01	10.3991000000000000