Year	Percent
2005-01-01	31.1013630131832
2006-01-01	32.5838836684534
2007-01-01	33.0647073730247
2008-01-01	33.0593295105167
2009-01-01	33.4815408619642
2010-01-01	34.4100600484956
2011-01-01	35.1710109234541
2012-01-01	36.5682097400726
2013-01-01	36.9023740068373
2014-01-01	36.2258233273025
2015-01-01	36.6050192335719
2016-01-01	37.0565590923130
2017-01-01	36.3802856052677