Year	Percent
1975	24.74152
1976	22.57166
1977	21.96974
1978	21.42514
1979	44.47201
1980	23.32347
1981	28.99284
1982	33.62521
1983	32.27727
1984	35.2276
1985	59.09222
1986	65.97292
1987	82.93756
1988	86.84698
1989	99.58202
1990	79.03344
1991	78.73129
1992	73.65549
1993	117.15902
1994	155.61898
1995	140.94034
1996	148.83708
1997	171.71853
1998	188.93448
1999	161.62428
2000	159.976
2001	106.75965
2002	103.9579
2003	126.30781
2004	144.56723
2005	137.22084
2006	187.46877
2007	326.35899
2008	119.27503
2009	204.4911
2010	190.04663
2011	112.70367
2012	124.10182
2013	127.37555
2014	95.236
2015	81.56406
2016	103.88673
2017	109.99066