Year	Percent
1980-01-01	0.49644499999999997
1981-01-01	0.48623100000000000
1982-01-01	0.42167400000000000
1983-01-01	0.35469400000000000
1984-01-01	0.54218000000000000
1985-01-01	0.64013800000000000
1986-01-01	0.56677300000000000
1987-01-01	0.49540600000000000
1988-01-01	0.49540600000000000
1989-01-01	0.49540600000000000
1990-01-01	0.49540600000000000
1991-01-01	0.49540600000000000
1992-01-01	0.49540600000000000
1993-01-01	0.49540600000000000
1994-01-01	0.49540600000000000
1995-01-01	0.49540600000000000
1996-01-01	0.49540600000000000
1997-01-01	2.38023000000000000
1998-01-01	5.14779000000000050
1999-01-01	5.08785000000000000
2000-01-01	9.76435000000000000
2001-01-01	18.05360000000000000
2002-01-01	18.74550000000000000
2003-01-01	17.02690000000000000
2004-01-01	21.93520000000000000
2005-01-01	22.03750000000000000
2006-01-01	24.07610000000000000
2007-01-01	22.73540000000000000
2008-01-01	24.28530000000000000
2009-01-01	25.27370000000000000
2010-01-01	23.08590000000000000
2011-01-01	21.33740000000000000
2012-01-01	18.94580000000000000
2013-01-01	19.68430000000000000
2014-01-01	24.75200000000000000
2015-01-01	35.75790000000000000
2016-01-01	41.82270000000000000