Year	Percent
1999-01-01	19.3664
2000-01-01	16.5726
2001-01-01	13.6421
2002-01-01	20.1832
2003-01-01	18.7128
2004-01-01	20.7569
2005-01-01	26.1230
2006-01-01	31.1963
2007-01-01	36.7757
2008-01-01	22.1268
2009-01-01	33.4621
2010-01-01	36.7919
2011-01-01	26.8489
2012-01-01	34.3496
2013-01-01	37.1714
2014-01-01	45.1099
2015-01-01	35.8740
2016-01-01	47.2307