Year	Percent
1995	34.64
1996	32.66
1997	29.6
1998	36.56
1999	31.4
2000	31.11
2001	23.72
2002	18.7
2003	24.45
2004	24.8
2005	29.54
2006	32.3
2007	31.7
2008	35.29
2009	42.95
2010	44.22