Year	Percent
1975	6.99
1976	7.82
1980	8.4
1981	7.9
1982	9.4
1983	9.34
1986	5.67
1992	3.9379
2002	12.83
2004	7.6
2005	6.4
2006	7.2
2007	7.1
2009	8.8
2011	11.2
2012	11.9