Year	Percent
1980-01-01	0.25947900000000000
1981-01-01	0.24253300000000000
1982-01-01	0.36248600000000003
1983-01-01	0.45389900000000000
1984-01-01	0.31868900000000000
1985-01-01	0.37696700000000000
1986-01-01	0.46096499999999996
1987-01-01	0.46206800000000003
1988-01-01	0.31275400000000000
1989-01-01	0.16579900000000000
1990-01-01	0.15787400000000001
1991-01-01	0.19908199999999998
1992-01-01	0.16980499999999998
1993-01-01	1.33283000000000000
1994-01-01	3.35270000000000000
1995-01-01	4.76498000000000000
1996-01-01	6.78830000000000000
1997-01-01	10.06370000000000000
1998-01-01	14.05330000000000000
1999-01-01	14.70940000000000000
2000-01-01	12.68080000000000000
2001-01-01	13.31260000000000000
2002-01-01	16.66590000000000000
2003-01-01	15.80980000000000000
2004-01-01	17.77120000000000000
2005-01-01	16.67640000000000000
2006-01-01	16.53170000000000000
2007-01-01	14.02950000000000000
2008-01-01	12.11990000000000000
2009-01-01	14.91770000000000000
2010-01-01	14.30850000000000000
2011-01-01	12.35280000000000000
2012-01-01	14.69090000000000000
2013-01-01	15.03350000000000000
2014-01-01	14.80960000000000000
2015-01-01	18.33810000000000000
2016-01-01	19.54720000000000000