Year	Percent
1995	15.10869
1996	27.06775
1997	29.88481
1998	30.37026
1999	18.38502
2000	14.31708
2001	37.74376
2002	38.72534
2003	39.55059
2004	50.6333
2005	47.1392
2006	50.59934
2007	52.66337
2008	54.13892
2009	42.74474
2010	47.92146
2011	49.37353
2012	53.59664
2013	51.9093
2014	54.22296
2015	56.42637
2016	57.47523
2017	61.25975