Year	Percent
1993	41.77964
1994	33.09515
1995	28.96089
1996	41.60411
1997	33.51273
1998	42.35769
1999	39.89919
2000	39.9677
2001	40.68009
2002	42.42597
2003	38.66491
2004	50.09553
2005	48.48395
2006	48.24554
2007	52.52223
2008	44.30609
2009	56.20745
2010	55.61856
2011	59.48544
2012	67.85471
2013	63.78698
2014	64.87134
2015	69.51072
2016	70.7364