Year	Percent
1996-01-01	16.2146
1997-01-01	17.3822
1998-01-01	18.5283
1999-01-01	25.1194
2000-01-01	22.8627
2001-01-01	24.9603
2002-01-01	30.0213
2003-01-01	24.2927
2004-01-01	24.6562
2005-01-01	18.9174
2006-01-01	20.6172
2007-01-01	23.5957
2008-01-01	22.1509
2009-01-01	21.5818
2010-01-01	22.1489
2011-01-01	18.3377
2012-01-01	17.1998
2013-01-01	18.7621
2014-01-01	19.0122
2015-01-01	18.1705
2016-01-01	15.5491