Year	Percent
1995	29.01
1996	27.64
1997	28.65
1998	27.56
1999	26.67
2000	31.08
2001	43.74
2002	41.99
2003	42.94
2004	50.45
2005	51.09
2006	56.54
2007	45.62
2008	45.43
2009	45.03
2010	41.62