Year	Percent
1995	32.53
1996	36.34
1997	34.94
1998	35.3
1999	37
2000	36.82
2001	37.16
2002	38.52
2003	38.74
2004	37.47
2005	55.34
2006	57.2
2007	56.09
2008	54.15
2009	54.47
2010	55.49