Year	Percent
1995	21.63
1996	22.01
1997	21.36
1998	22.66
1999	22.17
2000	22.28
2001	22.75
2002	22.65
2003	22.29
2004	22.72
2005	21.92
2006	21.11
2007	19.16
2008	16.72
2009	17.12
2010	14.48