Year	Percent
1977	4.23
1979	4.13
1981	5.66
1982	5.87
1983	8.79
1984	10.24
1985	11.93
1986	9.91
1987	7.11
1988	6.01
1989	9.01
1994	9.68
1995	12.83
1996	14.56
2002	18.82
2003	20.29
2005	11.6486
2006	9.3859
2007	7.6459
2008	6.2181
2009	5.9639
2010	6.9511
2011	7.2083
2012	7.1129