Year	Percent
1996-01-01	31.7336
1997-01-01	24.1789
1998-01-01	30.3261
1999-01-01	24.1137
2000-01-01	30.2227
2001-01-01	41.0111
2002-01-01	20.2684
2003-01-01	20.3273
2004-01-01	17.3775
2005-01-01	19.4219
2006-01-01	17.2196
2007-01-01	20.3634
2008-01-01	20.3256
2009-01-01	24.2879
2010-01-01	24.1026
2011-01-01	21.3034
2012-01-01	20.2779
2013-01-01	21.3694
2014-01-01	31.2835
2015-01-01	29.6777
2016-01-01	32.2633