Year	Percent
1960	108.4184
1961	117.45189
1962	112.7727
1963	110.70007
1964	117.14268
1965	118.69087
1966	121.93182
1967	112.30221
1968	117.49902
1969	122.76052
1970	124.72471
1971	133.04335
1972	122.1561
1973	114.28642
1974	190.10575
1975	132.64924
1976	168.91906
1977	127.39868
1978	112.47431
1979	102.44618
1980	116.34371
1981	98.48281
1982	83.16528
1983	63.56464
1984	52.75179
1985	49.78363
1986	57.06605
1987	55.88004
1988	56.46172
1989	64.76895
1990	60.55643
1991	68.80303
1992	51.3829
1993	66.92382
1994	60.6605
1995	78.22917
1996	80.63147
1997	96.41408
1998	86.98322
1999	81.43654
2000	92.98118
2001	88.94179
2002	83.51212
2003	80.22327
2004	85.65494
2005	97.83067
2006	112.35833
2007	97.30514
2008	101.33319
2009	83.86568
2010	78.80368
2011	96.15393
2012	86.04942
2013	118.0423
2014	95.00859
2015	83.09723
2016	70.22668
2017	58.35843