Year	Percent
1996-01-01	31.7622
1997-01-01	28.7354
1998-01-01	32.3646
1999-01-01	32.3757
2000-01-01	32.2050
2001-01-01	31.2081
2002-01-01	35.2826
2003-01-01	28.5798
2004-01-01	33.3734
2005-01-01	42.8164
2006-01-01	34.0879
2007-01-01	29.4616
2008-01-01	48.0693
2009-01-01	53.5685
2010-01-01	59.7078
2011-01-01	64.5648
2012-01-01	50.0095
2013-01-01	52.1468
2014-01-01	50.5844
2015-01-01	56.4466
2016-01-01	60.4751