Year	Percent
2000	44.69748
2001	45.68379
2002	45.95542
2003	40.89077
2004	41.18204
2005	43.54412
2006	44.51019
2007	45.50385
2008	48.72933
2009	45.65543
2010	49.69072
2011	56.35033
2012	59.57921
2013	58.76402
2014	62.57787
2015	57.57941
2016	54.04133
2017	50.23535