Year	Percent
1982	5.4297
1983	6.27833
1984	7.20805
1985	6.37929
1986	6.7537
1988	5.97023
1989	5.19128
1990	4.41394
1991	4.95248
1992	5.04877
1993	6.23357
1994	5.92463
1995	6.61171
1996	7.53024
1997	6.5389
1998	8.01374
1999	7.0152
2000	10.01785
2001	8.52734
2002	9.24917
2003	9.36551
2004	7.6827
2005	8.34658
2006	9.03099
2007	7.51947
2008	8.41593
2009	9.23553
2010	13.1433
2011	13.50758
2012	14.70415
2013	14.37788
2014	13.33689
2015	13.77231
2016	13.16387