Year	Percent
1995	28.32
1996	29.63
1997	30.24
1998	27.53
1999	29.07
2000	32.6
2001	37.33
2002	43.54
2003	40.56
2004	43
2005	45.63
2006	42.6
2007	41.62
2008	43.37
2009	41.91
2010	39.16