Year	Percent
1971	95.60695
1972	92.49302
1973	93.83873
1974	92.67747
1975	94.18851
1976	101.27813
1977	100.74891
1978	108.11135
1979	109.42116
1980	102.22899
1981	93.27627
1982	91.28052
1983	92.1761
1984	97.77244
1985	99.98391
1986	97.04543
1987	98.41899
1988	102.33848
1989	97.65247
1990	95.36968
1991	97.75566
1992	97.01695
1993	99.28284
1994	96.84341
1998	101.62769
1999	101.44978
2000	100.14678
2001	101.35879
2002	105.41577
2004	100.65758
2005	100.35957
2006	102.03966
2007	101.75592
2008	100.96915
2009	97.97162
2010	99.1185
2011	99.62967
2012	98.26137
2013	99.28279
2014	98.78085
2015	98.74251
2016	103.88269