Year	Percent
1971	101.90102
1972	101.0776
1973	104.12961
1974	99.45607
1975	98.40597
1976	97.45731
1977	96.19829
1978	98.80655
1979	98.85561
1980	100.05574
1981	99.76434
1982	99.53153
1983	99.67055
1984	99.41468
1985	98.22606
1986	98.46469
1990	94.50446
1991	94.20622
1992	89.58398
1993	95.98373
1994	97.8513
1995	95.52417
1996	95.10315
1997	95.28128
1999	98.12522
2000	101.6339
2001	106.01896
2002	131.79738
2003	102.51667
2004	102.06292
2005	98.24602
2006	97.04594
2007	95.73657
2008	98.5452
2009	105.22239
2010	106.27768
2011	107.14169
2012	103.32163
2013	99.57216
2014	98.21013
2015	96.75593
2016	97.35472