Year	Percent
1995	20.76
1996	20.4
1997	19.86
1998	20.24
1999	20.78
2000	17.56
2001	18.73
2002	18.14
2003	20.61
2004	26.67
2005	34.56
2006	34.26
2007	43.02
2008	9.195
2009	13.37
2010	14.6