Year	Percent
1996-01-01	39.1995
1997-01-01	30.3932
1998-01-01	21.8045
1999-01-01	27.5974
2000-01-01	31.8935
2001-01-01	31.3255
2002-01-01	34.9175
2003-01-01	46.3032
2004-01-01	45.4564
2005-01-01	42.0118
2006-01-01	43.9127
2007-01-01	42.7296
2008-01-01	42.3476
2009-01-01	48.0735
2010-01-01	49.3604
2011-01-01	50.0862
2012-01-01	51.7994
2013-01-01	54.5520
2014-01-01	54.4722