Year	Percent
1995	32.49
1996	31.58
1997	30.47
1998	29.7
1999	30.17
2000	27.53
2001	30.64
2002	30.4
2003	29.97
2004	31.42
2005	31.33
2006	30.64
2007	33.05
2008	35.11
2009	35.21
2010	34.52