Year	Percent
1995	49.34583
1996	55.26713
1997	54.78709
1998	48.52829
1999	52.08642
2000	49.77767
2001	49.85355
2002	52.74043
2003	53.4812
2004	50.7068
2005	51.1443
2006	45.25597
2007	47.45246
2008	40.81904
2009	36.87212
2010	39.22522
2011	44.97096
2012	43.48292
2013	43.34395
2014	41.53324
2015	42.80453
2016	43.33028
2017	42.53796