Year	Percent
1996-01-01	26.3678
1997-01-01	23.6059
1998-01-01	18.4027
1999-01-01	22.4968
2000-01-01	26.7996
2001-01-01	21.9991
2002-01-01	32.4902
2003-01-01	36.4823
2004-01-01	32.2989
2005-01-01	26.3965
2006-01-01	21.3955
2007-01-01	20.8987
2008-01-01	21.7512
2009-01-01	19.7486
2010-01-01	20.1079
2011-01-01	18.6544
2012-01-01	20.4562
2013-01-01	21.8819
2014-01-01	23.1819
2015-01-01	17.7204
2016-01-01	16.5441