Year	Percent
1996-01-01	15.5267
1997-01-01	21.2377
1998-01-01	27.5344
1999-01-01	32.4987
2000-01-01	32.9695
2001-01-01	34.6287
2002-01-01	32.5359
2003-01-01	36.5746
2004-01-01	38.8761
2005-01-01	25.9131
2006-01-01	19.5827
2007-01-01	20.3257
2008-01-01	15.8034
2009-01-01	16.3320
2010-01-01	20.4564
2011-01-01	24.3929
2012-01-01	20.1707
2013-01-01	16.7083
2014-01-01	15.9109
2015-01-01	18.1889
2016-01-01	16.3067