Year	Percent
1995	28.96
1996	33.82
1997	32.18
1998	35.85
1999	37.29
2000	36.92
2001	37.19
2002	37.54
2003	30.76
2004	31.35
2005	31.42
2006	16.2
2007	16.47
2008	16.46
2009	14.27
2010	13.62