Year	Percent
1995	29.64
1996	29.56
1997	28.75
1998	29.44
1999	30.07
2000	31.03
2001	32.28
2002	32.74
2003	33.92
2004	34.86
2005	37.87
2006	35.76
2007	37.52
2008	37.76
2009	34.76
2010	30.36