Year	Percent
1972	107.14675
1973	107.14286
1974	110.72165
1975	102.02737
1976	113.49325
1977	105.69185
1978	96.80851
1979	102.08927
1980	92.38881
1981	89.87451
1982	84.10869
1983	80.0157
1984	60.27139
1986	116.45102
1997	109.26162
1998	118.32509
1999	121.16942
2000	119.50147
2001	130.03223
2002	123.7239
2003	125.60455
2004	112.2905
2005	104.28611
2006	107.38049
2007	107.53196
2008	105.39578
2009	102.05128
2010	106.10543
2011	111.70999
2012	107.75431
2013	106.60085
2014	100.28686
2015	101.16993