Year	Percent
1995	35.88
1996	35.52
1997	39.31
1998	38.18
1999	38.41
2000	38.09
2001	38.34
2002	40.54
2003	45.46
2004	43.5
2005	47.38
2006	51.33
2007	52.47
2008	48.92
2009	37.03
2010	39.5