Year	Percent
1995	29.35
1996	30.48
1997	35.04
1998	52.78
1999	51.69
2000	54.25
2001	53.59
2002	54.53
2003	53.06
2004	47.42
2005	46.14
2006	47.31
2007	47.58
2008	44.06
2009	44.46
2010	42.74