Year	Percent
1995	25.55
1996	20.76
1997	23.51
1998	26.14
1999	29.12
2000	33.46
2001	31.35
2002	25.58
2003	22.4
2004	32.69
2005	29.17
2006	33.98
2007	39.57
2008	41.17
2009	35.06
2010	37.89