Year	Percent
1996-01-01	19.9039
1997-01-01	31.7657
1998-01-01	33.5499
1999-01-01	31.0918
2000-01-01	25.7756
2001-01-01	39.3802
2002-01-01	81.0998
2003-01-01	88.1795
2004-01-01	31.5425
2005-01-01	14.5281
2006-01-01	17.0302
2007-01-01	20.0509
2008-01-01	18.7190
2009-01-01	17.3619
2010-01-01	16.8159
2011-01-01	18.2675
2012-01-01	18.8197
2013-01-01	17.9655
2014-01-01	18.5530
2015-01-01	18.5300
2016-01-01	17.7942