Year	Percent
1971	95.79877
1972	97.50798
1973	106.40112
1974	104.28373
1975	103.86841
1976	107.64592
1977	101.49395
1978	99.96666
1979	102.80686
1980	99.35588
1981	103.69191
1982	101.17638
1983	102.91567
1984	108.98963
1985	106.52096
1986	105.43884
1987	104.68994
1988	99.90892
1989	95.04233
1990	99.02884
1991	96.53295
1992	107.47127
1993	106.76741
1994	108.80934
1995	108.44172
1997	97.09213
1998	99.07721
1999	103.6674
2000	103.19853
2001	99.62476
2002	94.78652
2003	100.83775
2004	99.64296
2005	97.80467
2006	99.08627
2007	101.01884
2008	100.0238
2009	101.54937
2010	101.12547
2011	103.1019
2012	109.54378
2013	102.21169
2014	94.26092
2015	98.88245