Year	Percent
1971	111.55315
1972	111.70451
1973	106.46607
1974	106.15533
1975	93.19319
1976	70.31083
1977	98.96552
1978	91.94274
1979	101.33736
1980	104.1048
1981	117.82847
1982	103.53473
1983	100.43912
1984	101.2761
1985	98.19413
1986	97.71471
1987	102.82506
1988	98.5064
1989	98.49281
1990	99.02405
1991	98.91457
1992	100.84448
1993	106.82944
1994	104.13105
1995	97.52954
1996	101.50862
1997	95.94937
1998	102.47994
1999	105.33677
2000	109.93673
2001	106.85757
2002	106.45651
2003	103.67534
2004	100.30864
2005	95.41391
2006	97.45597
2007	94.55128
2008	95.95543
2009	90.97519
2010	97.31664
2011	102.54237
2012	91.05058
2013	94.34717
2014	104.34783
2015	99.89637
2016	102.55075