Year	Percent
1995	27.48
1996	28.46
1997	25.07
1998	25.32
1999	24.74
2000	24.93
2001	24.27
2002	23.72
2003	23.52
2004	22.64
2005	23.04
2006	23.21
2007	23.12
2008	23.3
2009	25.09
2010	30.84