Year	Percent
1996-01-01	28.9855
1997-01-01	18.4546
1998-01-01	21.8527
1999-01-01	21.9007
2000-01-01	18.1920
2001-01-01	16.4843
2002-01-01	16.7158
2003-01-01	17.5239
2004-01-01	15.4801
2005-01-01	15.2097
2006-01-01	10.5161
2007-01-01	15.1845
2008-01-01	12.8545
2009-01-01	11.1894
2010-01-01	14.8170
2011-01-01	14.5896
2012-01-01	14.5634
2013-01-01	12.1677
2014-01-01	15.1468
2015-01-01	15.8681
2016-01-01	13.1681