Year	Percent
1993	57.15359
1994	58.4702
1995	57.25336
1996	60.55571
1997	61.74533
1998	62.52226
1999	63.35775
2000	63.87782
2001	63.87829
2002	65.74534
2003	65.61753
2004	64.2417
2005	64.46658
2006	64.65839
2007	64.75082
2008	66.46629
2009	68.13903
2010	66.54909
2011	65.87408
2012	65.47184
2013	64.33925
2014	63.70983
2015	61.94392
2016	61.27269
2017	59.88918