Year	Percent
1970	71.35881
1971	68.9392
1972	67.45877
1973	75.91179
1974	101.08053
1975	86.33233
1976	86.4914
1977	90.42914
1978	80.53209
1979	84.61933
1980	86.40644
1981	80.57035
1982	76.56059
1983	73.65833
1984	76.47608
1985	79.15216
1986	73.82461
1987	78.46772
1988	79.91317
1989	82.4683
1990	88.65011
1991	87.86585
1992	88.70582
1993	94.09325
1994	95.74011
1995	131.70378
1996	123.46544
1997	115.48552
1998	112.97
1999	114.65933
2000	126.52848
2001	110.16274
2002	107.2279
2003	106.85131
2004	104.79331
2005	106.81628
2006	126.83017
2007	128.97264
2008	148.72485
2009	149.23924
2010	154.16622
2011	158.06576
2012	160.60965
2013	150.78707
2014	136.68713
2015	132.40195
2016	125.41101