Year	Percent
1993-01-01	56.5855
1994-01-01	56.3386
1995-01-01	60.8772
1996-01-01	62.3794
1997-01-01	59.8362
1998-01-01	57.1001
1999-01-01	54.9806
2000-01-01	56.9638
2001-01-01	60.2357
2002-01-01	62.6063
2003-01-01	63.5424
2004-01-01	62.2627
2005-01-01	61.7727
2006-01-01	63.0143
2007-01-01	63.7365
2008-01-01	68.4558
2009-01-01	70.7817
2010-01-01	69.4361
2011-01-01	69.5091
2012-01-01	72.3046
2013-01-01	75.0852
2014-01-01	75.2147
2015-01-01	75.7132
2016-01-01	77.8903