Year	Percent
1996-01-01	29.5395
1997-01-01	29.1173
1998-01-01	23.5285
1999-01-01	26.5046
2000-01-01	23.9228
2001-01-01	23.0876
2002-01-01	20.6324
2003-01-01	18.7588
2004-01-01	20.6181
2005-01-01	22.2411
2006-01-01	23.8178
2007-01-01	26.3016
2008-01-01	25.7256
2009-01-01	27.4329
2010-01-01	22.1532
2011-01-01	18.4707
2012-01-01	21.0174
2013-01-01	18.2857
2014-01-01	16.2232
2015-01-01	27.7341
2016-01-01	23.4365