Year	Percent
1999-01-01	32.5485
2000-01-01	33.3028
2001-01-01	38.5648
2002-01-01	37.1986
2003-01-01	36.1969
2004-01-01	37.9848
2005-01-01	36.1528
2006-01-01	33.9525
2007-01-01	31.5426
2008-01-01	26.7040
2009-01-01	33.0558
2010-01-01	36.2317
2011-01-01	35.6638
2012-01-01	30.4119
2013-01-01	28.5022
2014-01-01	28.7684
2015-01-01	30.3748
2016-01-01	28.9209