Year	Percent
1995	26.12
1996	28.56
1997	29.21
1998	34.91
1999	38.14
2000	40.12
2001	41.34
2002	41.05
2003	41.19
2004	40.42
2005	38.02
2006	36.77
2007	35.82
2008	35.69
2009	36.65
2010	37.92