Year	Percent
1995	31.31
1996	35.42
1997	30.18
1998	38.11
1999	34.51
2000	32.31
2001	34.11
2002	33.33
2003	15.2
2004	24.93
2005	19.15
2006	20.14
2007	17.71
2008	17.95
2009	21.02
2010	21.89