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	0.97473300000000000
1997-01-01	3.21331000000000000
1998-01-01	5.94856000000000000
1999-01-01	5.08785000000000000
2000-01-01	9.76436000000000000
2001-01-01	18.05360000000000000
2002-01-01	18.74550000000000000
2003-01-01	17.02690000000000000
2004-01-01	21.93520000000000000
2005-01-01	26.44680000000000000
2006-01-01	33.71000000000000000
2007-01-01	41.68750000000000000
2008-01-01	42.76010000000000000
2009-01-01	53.62340000000000000
2010-01-01	56.83630000000000000
2011-01-01	56.33800000000000000
2012-01-01	51.99560000000000000
2013-01-01	65.13540000000000000
2014-01-01	70.19750000000000000
2015-01-01	80.70670000000000000
2016-01-01	86.59560000000000000