Year	Percent
1994	18.97146
1995	23.43624
1996	31.55673
1997	34.8093
1999	33.31209
2000	35.73968
2001	36.75431
2002	36.3324
2003	40.79191
2004	47.13532
2005	57.19118
2006	55.68031
2007	53.92903
2008	54.07798
2009	55.90655
2010	47.07613
2011	45.06885
2012	41.76319
2013	39.90319
2015	42.53965