Year	Percent
1994	16.82
1998	16.36
1999	21.4
2000	5.47
2001	5.63
2002	22.25
2003	21.58
2004	23.05
2005	22.79
2006	17.02
2007	16.53
2008	15.04
2009	15.63
2010	14.08
2011	13.17
2012	12.46