Year	Percent
1996-01-01	44.9399
1997-01-01	47.8843
1998-01-01	46.0983
1999-01-01	49.5763
2000-01-01	59.4400
2001-01-01	58.0675
2002-01-01	50.7565
2003-01-01	51.3111
2004-01-01	50.3323
2005-01-01	52.8802
2006-01-01	56.9838
2007-01-01	52.6807
2008-01-01	41.1964
2009-01-01	41.2951
2010-01-01	42.6318
2011-01-01	39.5416
2012-01-01	50.8966
2013-01-01	45.3389
2014-01-01	49.4983