Year	Percent
1980-01-01	1.4532100000000001
1981-01-01	1.7401400000000002
1982-01-01	3.0258500000000000
1983-01-01	3.9107199999999995
1984-01-01	3.3873500000000000
1985-01-01	3.2227600000000000
1986-01-01	3.7514000000000000
1987-01-01	2.5359300000000000
1988-01-01	2.9002400000000000
1989-01-01	1.5412200000000000
1990-01-01	1.3732000000000000
1991-01-01	0.8229700000000001
1992-01-01	1.1269300000000000
1993-01-01	1.5897200000000000
1994-01-01	1.3073000000000000
1995-01-01	1.2898000000000000
1996-01-01	1.4808600000000000
1997-01-01	1.6776099999999998
1998-01-01	1.9952599999999998
1999-01-01	3.1660100000000000
2000-01-01	4.2351500000000000
2001-01-01	4.8686200000000000
2002-01-01	5.9124000000000000
2003-01-01	7.2570800000000000
2004-01-01	7.9412600000000010
2005-01-01	8.8252500000000000
2006-01-01	9.7256400000000000
2007-01-01	9.1905700000000000
2008-01-01	7.7138800000000005
2009-01-01	7.5303800000000000
2010-01-01	7.9495200000000000
2011-01-01	7.5076100000000010
2012-01-01	7.3664800000000000
2013-01-01	7.8307199999999995
2014-01-01	9.2624800000000000
2015-01-01	9.9023600000000000
2016-01-01	8.7193800000000010