Year	Percent
1995	30.96
1996	27.89
1997	24.29
1998	28.47
1999	28.29
2000	18.14
2001	26.73
2002	25.17
2003	27.25
2004	25.38
2005	30.42
2006	37.98
2007	41.57
2008	44.52
2009	43.45
2010	40.64