Year	Percent
2003	37.79544
2004	39.22924
2005	41.06066
2006	37.80312
2007	36.20226
2008	36.97913
2009	30.73112
2010	34.05597
2011	37.99793
2012	37.51199
2013	37.91887
2014	38.53128
2015	37.0831
2016	38.98097