Year	Percent
1995-01-01	12.75
1996-01-01	15.56
1997-01-01	19.40
1998-01-01	21.40
1999-01-01	32.59
2000-01-01	29.84
2001-01-01	25.39
2002-01-01	24.63
2003-01-01	25.77
2004-01-01	24.55
2005-01-01	26.85
2006-01-01	27.54
2007-01-01	25.50
2008-01-01	22.07
2009-01-01	27.01
2010-01-01	27.78
2011-01-01	25.97
2012-01-01	28.18
2013-01-01	30.24
2014-01-01	32.08
2015-01-01	33.53
2016-01-01	33.93