Year	Percent
1995	13.48
1996	24.03
1997	22.4
1998	23.34
1999	19.71
2000	27.26
2001	27.63
2002	28.21
2003	29.69
2004	32.04
2005	34.37
2006	33.17
2007	33.22
2008	33.12
2009	27.52
2010	29.82