Year	Percent
1995	37.85
1996	40.27
1997	40
1998	40.35
1999	35.62
2000	41.97
2001	42.03
2002	36.31
2003	43.77
2004	45.72
2005	42.28
2006	42.67
2007	43.88
2008	43.7
2009	47.92
2010	52.93