Year	Percent
1995	14.81
1996	14.35
1997	17.62
1998	15.18
1999	17.27
2000	20.75
2001	34.41
2002	19.91
2003	20.61
2004	23.93
2005	29.82
2006	25.2
2007	20.14
2008	15.49
2009	23.69
2010	23.09