Year	Percent
1996-01-01	34.4156
1997-01-01	45.2000
1998-01-01	36.9768
1999-01-01	55.8557
2000-01-01	35.0937
2001-01-01	29.9363
2002-01-01	35.9096
2003-01-01	37.8209
2004-01-01	41.1816
2005-01-01	45.8019
2006-01-01	47.3743
2007-01-01	33.7150
2008-01-01	28.4987
2009-01-01	33.9222
2010-01-01	26.2724
2011-01-01	22.4958
2012-01-01	20.8168
2013-01-01	21.7226
2014-01-01	20.6305
2015-01-01	22.8614
2016-01-01	26.3883