Year	Percent
1996-01-01	37.187100000000000
1997-01-01	36.025999999999996
1998-01-01	35.195700000000000
1999-01-01	35.373700000000000
2000-01-01	34.562900000000000
2001-01-01	34.791400000000000
2002-01-01	35.733600000000000
2003-01-01	35.030800000000000
2004-01-01	33.111500000000000
2005-01-01	33.982600000000000
2006-01-01	33.922900000000000
2007-01-01	32.931200000000000
2008-01-01	32.519800000000000
2009-01-01	32.065300000000000
2010-01-01	30.130400000000000
2011-01-01	29.478400000000000
2012-01-01	28.804300000000000
2013-01-01	29.211800000000000
2014-01-01	29.345500000000000
2015-01-01	30.286800000000000
2016-01-01	33.327400000000000