Year	Percent
1995	47.93
1996	45.4
1997	42.66
1998	41.79
1999	32.06
2000	28.35
2001	27.86
2002	28.09
2003	28.02
2004	28.34
2005	27.24
2006	26.7
2007	29.24
2008	35.4
2009	37.61
2010	37.14