Year	Percent
1995	47.85652
1996	47.43845
1997	48.73227
1998	49.23423
1999	48.48139
2000	53.67352
2001	52.78977
2002	51.16958
2003	51.21262
2004	56.41087
2005	60.21754
2006	64.74323
2007	68.8949
2008	68.03552
2009	55.37386
2010	62.85322
2011	68.53835
2012	68.90662
2013	68.95777
2014	68.41448
2015	68.40446
2016	68.49812
2017	72.55322