Year	Percent
1993	21.18352
1994	25.31888
1995	57.81678
1996	65.72793
1997	66.30029
1998	67.01831
1999	67.66496
2000	57.58369
2001	66.72111
2002	73.33554
2003	66.89356
2004	86.41318
2005	68.51406
2006	73.53097
2007	74.60719
2008	55.77487
2009	51.63878
2010	47.29289
2011	39.04088
2012	36.22916
2013	31.43751
2014	31.39925
2015	37.58565
2016	36.84431