Year	Percent
1974	37.23175
1975	135.16538
1976	179.95092
1977	155.00962
1978	76.63565
1979	62.09007
1980	76.45327
1981	51.85036
1982	37.01492
1983	39.02016
1984	41.84998
1985	35.26506
1986	35.27882
1987	42.00408
1988	53.96364
1989	66.57175
1990	84.30378
1991	66.00932
1992	129.92111
1993	115.87792
1994	123.40355
1995	119.53734
1996	108.25535
1997	72.11604
1998	119.08305
1999	110.04628
2000	105.22868
2001	79.41086
2002	70.54702
2003	65.53988
2004	75.92243
2005	51.32116
2006	86.41306
2007	180.3435
2008	173.72701
2009	185.7212
2010	107.78413
2011	93.25855
2012	154.2995
2013	166.4824
2014	165.81347
2015	140.20725
2016	113.48949