Year	Percent
1999-01-01	32.1933
2000-01-01	38.0763
2001-01-01	39.4264
2002-01-01	52.3499
2003-01-01	54.6937
2004-01-01	59.6976
2005-01-01	58.3253
2006-01-01	62.7891
2007-01-01	68.3198
2008-01-01	63.0899
2009-01-01	70.0860
2010-01-01	68.7104
2011-01-01	65.9734
2012-01-01	74.9949
2013-01-01	67.5866
2014-01-01	62.8628
2015-01-01	60.9593
2016-01-01	54.6523