Year	Percent
1996-01-01	67.8073
1997-01-01	72.9106
1998-01-01	68.0282
1999-01-01	65.3612
2000-01-01	65.4639
2001-01-01	56.2691
2002-01-01	58.3138
2003-01-01	60.2972
2004-01-01	60.3687
2005-01-01	55.3571
2006-01-01	50.4178
2007-01-01	49.8195
2008-01-01	49.9463
2009-01-01	52.1620
2010-01-01	41.6114
2011-01-01	45.2589
2012-01-01	54.0091
2013-01-01	49.3945
2014-01-01	51.6081