Year	Percent
1996-01-01	31.133700000000000
1997-01-01	28.368200000000000
1998-01-01	24.758800000000000
1999-01-01	33.143800000000000
2000-01-01	35.596300000000000
2001-01-01	29.637300000000000
2002-01-01	28.852200000000000
2003-01-01	34.306999999999995
2004-01-01	36.957600000000000
2005-01-01	41.015400000000000
2006-01-01	49.051700000000000
2007-01-01	39.805300000000000
2008-01-01	25.240400000000000
2009-01-01	33.878700000000000
2010-01-01	33.102900000000000
2011-01-01	33.022800000000000
2012-01-01	37.968000000000000
2013-01-01	41.282000000000000
2014-01-01	44.183200000000000