Year	Percent
1995	25.68
1996	27.12
1997	25.05
1998	20.13
1999	19.04
2000	21.25
2001	20.48
2002	28.17
2003	23.33
2004	24.67
2005	25.56
2006	29.99
2007	30.68
2008	33.48
2009	34.84
2010	38.48