Year	Percent
1997-01-01	0.328882000000000
1998-01-01	0.308153000000000
1999-01-01	25.495500000000000
2000-01-01	26.722600000000000
2001-01-01	29.495900000000000
2002-01-01	31.408900000000000
2003-01-01	28.519000000000002
2004-01-01	27.516200000000000
2005-01-01	27.485400000000000
2006-01-01	30.086800000000000
2007-01-01	34.914800000000000
2008-01-01	31.373500000000000
2009-01-01	40.810900000000000
2010-01-01	36.213500000000000
2011-01-01	32.334000000000000
2012-01-01	32.319700000000000
2013-01-01	30.785600000000000
2014-01-01	32.368000000000000
2015-01-01	34.870200000000000
2016-01-01	35.967200000000000