Year	Percent
1996-01-01	22.7008
1997-01-01	20.8977
1998-01-01	22.2213
1999-01-01	18.4351
2000-01-01	34.6481
2001-01-01	35.8251
2002-01-01	23.1173
2003-01-01	34.1963
2004-01-01	34.2265
2005-01-01	44.1672
2006-01-01	34.2278
2007-01-01	42.0377
2008-01-01	46.6571
2009-01-01	43.8337
2010-01-01	49.6142
2011-01-01	58.8786
2012-01-01	67.3064
2013-01-01	65.9792
2014-01-01	69.3641