Year	Percent
1995	38.69
1996	48.29
1997	46.37
1998	38.21
1999	30.53
2000	31.65
2001	37.87
2002	31.54
2003	34.43
2004	32.94
2005	35.18
2006	35.58
2007	39.74
2008	45.78
2009	44.61
2010	44.31