Year	Percent
1980	5.11541
1981	6.89145
1982	12.21996
1983	12.63184
1984	9.26166
1985	9.99114
1986	10.28977
1987	12.28407
1988	13.57066
1989	15.08696
1990	13.96232
1991	14.6141
1992	14.95898
1993	13.73454
1994	13.00458
1995	13.59639
1996	13.45218
1997	14.4455
1998	14.20024
1999	14.09157
2000	13.79611
2001	9.82631
2002	9.50793
2003	9.4207
2004	10.48944
2005	11.56937
2006	11.75644
2007	12.14745
2008	11.57888
2009	9.10067
2010	8.84763
2011	12.07813
2014	19.46369