Year	Percent
1990-01-01	0.47961400000000004
1991-01-01	0.45798100000000000
1992-01-01	0.45553100000000000
1993-01-01	0.45164300000000000
1994-01-01	0.40966499999999995
1995-01-01	0.39581200000000000
1996-01-01	0.34252200000000000
1997-01-01	0.32425500000000000
1998-01-01	0.29308700000000000
1999-01-01	0.25928300000000000
2000-01-01	0.23438000000000000
2001-01-01	0.23837500000000000
2002-01-01	0.22477199999999997
2003-01-01	0.23910800000000000
2004-01-01	0.22089899999999998
2005-01-01	0.24187600000000004
2006-01-01	0.20597600000000002
2007-01-01	0.17964500000000000
2008-01-01	0.15966800000000000
2009-01-01	0.86751499999999990
2010-01-01	0.61429300000000000
2011-01-01	0.63843700000000000
2012-01-01	0.61408100000000000
2013-01-01	0.50949800000000000
2014-01-01	0.63127400000000000
2015-01-01	0.39658000000000004
2016-01-01	0.58783200000000000
2017-01-01	0.31025100000000000