Year	Percent
1982	8.59246
1983	10.8809
1984	7.95964
1985	8.37302
1986	9.70101
1987	9.59381
1988	9.63399
1989	11.36479
1990	11.68548
1991	11.92967
1992	10.20936
1993	11.14198
1994	8.91414
1995	9.88362
1996	8.80223
1997	12.61236
1998	12.54517
1999	16.80116
2000	13.13491
2001	11.46971
2002	12.14655
2003	8.11903
2004	3.72026
2005	3.38032
2006	2.62817
2007	2.37394
2008	2.06952
2009	2.93112
2010	2.97716
2011	2.90986
2012	3.07717
2013	3.03035
2014	3.00477
2015	4.89357
2016	5.25483