Year	Percent
1982	100.59676
1983	102.75953
1984	98.02581
1985	93.17824
1986	97.55757
1987	92.55901
1988	90.31569
1989	87.37765
1990	78.02593
1991	77.50945
1992	65.50377
1993	58.83049
1994	57.26372
1995	51.7482
1996	48.70023
1997	49.72006
1998	51.10789
1999	56.53917
2000	58.9677
2001	59.22183
2002	59.5145
2003	58.29099
2004	54.4277
2005	52.27723
2006	50.5273
2007	52.06877
2008	47.15844
2009	35.22835
2010	32.65393
2011	32.67028
2012	33.06168
2013	30.40292
2014	31.62667
2015	38.7366
2016	34.51534
2017	32.00998