Year	Percent
1980-01-01	2.3452700000000000
1981-01-01	1.0560200000000002
1982-01-01	1.6352000000000000
1983-01-01	2.0505800000000000
1984-01-01	5.7434400000000005
1985-01-01	5.5432100000000000
1986-01-01	10.0549000000000000
1987-01-01	18.5566000000000000
1988-01-01	6.8201700000000000
1989-01-01	7.2687700000000000
1990-01-01	8.6355899999999990
1991-01-01	5.0040200000000000
1992-01-01	7.6534800000000000
1993-01-01	5.8688100000000000
1994-01-01	5.7455800000000000
1995-01-01	5.9058000000000000
1996-01-01	6.2787800000000000
1997-01-01	6.2545699999999990
1998-01-01	8.4894000000000000
1999-01-01	11.3575000000000000
2000-01-01	9.4580700000000000
2001-01-01	9.6529600000000000
2002-01-01	8.6411000000000000
2003-01-01	9.9107700000000000
2004-01-01	10.4761000000000000
2005-01-01	9.0552100000000000
2006-01-01	8.3013500000000000
2007-01-01	7.3263800000000000
2008-01-01	7.1478100000000010
2009-01-01	14.0120000000000000
2010-01-01	16.7063000000000000
2011-01-01	19.5397000000000000
2012-01-01	20.4190000000000000
2013-01-01	26.0690000000000030
2014-01-01	27.6076000000000000
2015-01-01	33.3401000000000000