Year	Percent
1996-01-01	32.75
1997-01-01	35.07
1998-01-01	35.60
1999-01-01	37.41
2000-01-01	41.40
2001-01-01	41.73
2002-01-01	36.82
2003-01-01	40.42
2004-01-01	39.31
2005-01-01	40.14
2006-01-01	39.03
2007-01-01	38.29
2008-01-01	33.53
2009-01-01	41.30
2010-01-01	41.46
2011-01-01	36.67
2012-01-01	42.46
2013-01-01	40.39
2014-01-01	11.82
2015-01-01	12.69