Year	Percent
1995-01-01	31.66
1996-01-01	30.47
1997-01-01	31.77
1998-01-01	33.37
1999-01-01	36.64
2000-01-01	31.77
2001-01-01	32.82
2002-01-01	33.86
2003-01-01	36.38
2004-01-01	36.72
2005-01-01	37.39
2006-01-01	37.06
2007-01-01	38.65
2008-01-01	35.08
2009-01-01	40.09
2010-01-01	40.62
2011-01-01	39.40
2012-01-01	40.37
2013-01-01	42.56
2014-01-01	45.67
2015-01-01	49.02
2016-01-01	52.00