Year	Percent
1999-01-01	52.4831
2000-01-01	65.7000
2001-01-01	63.7000
2002-01-01	63.6199
2003-01-01	64.4774
2004-01-01	67.2125
2005-01-01	70.4207
2006-01-01	71.9221
2007-01-01	70.4025
2008-01-01	72.2385
2009-01-01	72.2088
2010-01-01	70.6061
2011-01-01	64.2096
2012-01-01	69.1369