Year	Percent
1996-01-01	58.4606
1997-01-01	57.7554
1998-01-01	62.4392
1999-01-01	67.3054
2000-01-01	74.0589
2001-01-01	74.7615
2002-01-01	63.7211
2003-01-01	62.1247
2004-01-01	58.9209
2005-01-01	54.7265
2006-01-01	54.0694
2007-01-01	50.4344
2008-01-01	45.1220
2009-01-01	39.3376
2010-01-01	42.0463
2011-01-01	44.4649
2012-01-01	43.0091
2013-01-01	43.4402
2014-01-01	44.2568