Year	Percent
1980-01-01	2.3285900000000000
1981-01-01	2.0056200000000000
1982-01-01	1.6416900000000000
1983-01-01	1.6635900000000001
1984-01-01	3.1217700000000000
1985-01-01	5.3059600000000000
1986-01-01	9.3034900000000000
1987-01-01	14.1448000000000000
1988-01-01	15.6600000000000000
1989-01-01	14.1263000000000000
1990-01-01	9.3239399999999990
1991-01-01	8.7744400000000000
1992-01-01	6.3238100000000000
1993-01-01	8.3049800000000000
1994-01-01	5.9583300000000000
1995-01-01	5.6062000000000000
1996-01-01	7.2270900000000000
1997-01-01	5.5420300000000005
1998-01-01	7.0440100000000010
1999-01-01	9.5451500000000000
2000-01-01	9.2365300000000000
2001-01-01	10.3841000000000000
2002-01-01	10.2145000000000000
2003-01-01	8.2507700000000000
2004-01-01	6.9255400000000000
2005-01-01	5.7034699999999990
2006-01-01	6.2714800000000000
2007-01-01	9.3501200000000000
2008-01-01	7.0510500000000000
2009-01-01	13.8063000000000000
2010-01-01	11.6477000000000000
2011-01-01	10.1313000000000000
2012-01-01	10.2257000000000000
2013-01-01	11.5380000000000000
2014-01-01	10.8033000000000000
2015-01-01	12.3733000000000000
2016-01-01	21.2640000000000000