Year	Percent
1970	44.18086
1971	45.51076
1972	46.52573
1973	57.89782
1974	74.64137
1975	73.69201
1976	75.41418
1977	76.92383
1978	73.55353
1979	79.38918
1980	80.93357
1981	72.53553
1982	61.59886
1983	59.80599
1984	62.41846
1985	64.50003
1986	64.33492
1987	69.58024
1988	70.40501
1989	72.13423
1990	75.83363
1991	77.37196
1992	81.75958
1993	84.81218
1994	85.96184
1995	122.27289
1996	114.10462
1997	110.62284
1998	110.33657
1999	112.35691
2000	119.33377
2001	108.49794
2002	111.62501
2003	107.72103
2004	103.464
2005	104.37175
2006	123.45482
2007	129.53713
2008	148.47684
2009	147.73564
2010	153.25555
2011	160.31245
2012	165.25347
2013	157.06467
2014	148.6048
2015	139.46266
2016	136.10912