Year	Percent
1972	105.97932
1973	105.65018
1974	111.18421
1975	98.00518
1976	110.15047
1977	103.82118
1978	101.51589
1979	100.54801
1980	89.5039
1981	90.80334
1982	80.80404
1983	82.80808
1984	57.22352
1986	123.63359
1991	98.54566
1992	99.71207
1993	98.21176
1994	101.03111
1995	99.27599
1997	109.20255
1998	115.25558
1999	116.61053
2000	114.80815
2001	121.67613
2002	117.53295
2003	119.99123
2004	111.28146
2005	107.35931
2006	107.68566
2007	107.49107
2008	105.36371
2009	101.97784
2010	105.35389
2011	110.92974
2012	106.99311
2013	106.10853
2014	100.13226
2015	102.06525