Year	Percent
1982	11.13953
1983	10.84697
1984	17.36325
1985	13.73621
1986	11.91612
1987	18.67001
1988	16.78724
1989	17.82716
1990	21.00639
1991	14.86437
1992	17.18127
1993	17.87069
1994	16.82906
1995	22.76698
1996	25.87723
1997	24.78787
1998	23.66719
1999	20.32118
2000	31.00782
2001	32.66018
2002	34.37426
2003	35.1538
2004	40.85846
2005	32.58217
2006	28.46676
2007	27.24145
2008	32.95362
2009	43.69179
2010	55.13639
2011	58.00331
2012	58.04408
2013	60.23503
2014	53.30966
2015	39.1764
2016	41.55687
2017	47.38532