Year	Percent
1994	30.91138
1995	29.73773
1996	33.60324
1997	34.46389
1998	31.94264
1999	27.7235
2000	25.49411
2001	23.70166
2002	26.91449
2003	29.20763
2004	28.79041
2005	33.57316
2006	35.20778
2007	32.39901
2008	32.69023
2009	30.29293
2010	28.1215
2011	27.98307