Year	Percent
1995	24.66
1996	21.69
1997	20.54
1998	20.99
1999	20.55
2000	17.7
2001	16.11
2002	17.4
2003	19.01
2004	19.9
2005	20.64
2006	21.47
2007	22.94
2008	21.28
2009	24.2
2010	27.12