Year	Percent
1995	36.49
1996	40.3
1997	39.9
1998	48.36
1999	45.33
2000	39.17
2001	48.88
2002	52.27
2003	52.74
2004	53.57
2005	56.44
2006	46.46
2007	47.03
2008	47.39
2009	48.64
2010	50.07