Year	Percent
1995	40.37
1996	39.49
1997	40.18
1998	41.22
1999	42.52
2000	42.28
2001	45
2002	47.33
2003	50.08
2004	46.16
2005	40.52
2006	36.71
2007	42.4
2008	51.86
2009	52.51
2010	53.26