Year	Percent
1971	103.67824
1973	97.91556
1974	97.83481
1975	100.05318
1976	101.111
1977	101.14204
1978	101.673
1979	100.72164
1980	99.06438
1981	99.94496
1982	100.94585
1984	100.85818
1985	100.09508
1986	96.47621
1987	98.80202
1988	96.46854
1989	94.99457
1990	95.46107
1991	99.97256
1992	101.10236
1993	99.47402
1998	97.7316
1999	97.05893
2000	98.72255
2001	101.8334
2002	102.55831
2003	103.78964
2004	102.65094
2005	99.5081
2006	98.55068
2007	98.01903
2008	99.12235
2009	101.07597
2010	99.28016
2011	98.13786
2012	100.45172
2013	100.97641
2014	98.91387
2015	97.87897
2016	100.56841