Year	Percent
1995	27.11
1996	26.61
1997	28.04
1998	34.62
1999	28.87
2000	29.97
2001	28.1
2002	28.84
2003	30.05
2004	31.37
2005	30.6
2006	29.98
2007	29.11
2008	27.69
2009	27.68
2010	27.38