Year	Percent
1996-01-01	54.7218
1997-01-01	57.5423
1998-01-01	60.7837
1999-01-01	59.5994
2000-01-01	61.7546
2001-01-01	58.0752
2002-01-01	55.3324
2003-01-01	53.4352
2004-01-01	54.0214
2005-01-01	52.4347
2006-01-01	53.1577
2007-01-01	54.9175
2008-01-01	57.1247
2009-01-01	61.7495
2010-01-01	62.6651
2011-01-01	60.4792
2012-01-01	61.5082
2013-01-01	60.4735
2014-01-01	61.7031