Year	Percent
1996-01-01	30.9542
1997-01-01	33.6234
1998-01-01	36.9899
1999-01-01	40.5700
2000-01-01	42.7414
2001-01-01	42.4515
2002-01-01	45.8839
2003-01-01	45.4116
2004-01-01	47.7712
2005-01-01	50.0516
2006-01-01	52.1462
2007-01-01	56.1542
2008-01-01	54.5256
2009-01-01	52.3839
2010-01-01	52.5047
2011-01-01	54.6510
2012-01-01	60.0707
2013-01-01	61.1763
2014-01-01	64.1125