Year	Percent
1996-01-01	29.875999999999998
1997-01-01	33.944900000000000
1998-01-01	32.262200000000000
1999-01-01	32.465600000000000
2000-01-01	32.324700000000000
2001-01-01	35.191700000000000
2002-01-01	40.163700000000000
2003-01-01	45.956600000000000
2004-01-01	45.718000000000000
2005-01-01	46.403700000000000
2006-01-01	43.816700000000000
2007-01-01	41.645300000000000
2008-01-01	40.578600000000000
2009-01-01	42.324800000000000
2010-01-01	46.403500000000000
2011-01-01	43.455900000000000
2012-01-01	46.141400000000000
2013-01-01	47.766100000000000
2014-01-01	49.589700000000000
2015-01-01	51.830600000000000
2016-01-01	52.446500000000000