Year	Percent
1999-01-01	62.3521
2000-01-01	45.5990
2001-01-01	29.4910
2002-01-01	34.6438
2003-01-01	32.6730
2004-01-01	32.7611
2005-01-01	39.5054
2006-01-01	42.2915
2007-01-01	42.2025
2008-01-01	33.2751
2009-01-01	40.0844
2010-01-01	27.5533
2011-01-01	20.0755
2012-01-01	19.4045
2013-01-01	18.8966
2014-01-01	19.5939
2015-01-01	23.3019
2016-01-01	37.6429