Year	Percent
1995	23.75
1996	23.95
1997	22.39
1998	16.47
1999	18.26
2000	18.54
2001	18.9
2002	17.73
2003	12.66
2004	13.02
2005	11.3
2006	14.2
2007	19.6
2008	19.26
2009	23.14
2010	20.29