Year	Percent
1971	103.22755
1972	98.83749
1973	98.80166
1974	96.79081
1976	98.25966
1977	99.24477
1978	100.32329
1979	100.17082
1980	101.82165
1982	100.74934
1983	96.34783
1984	96.27554
1985	95.57795
1988	94.34192
1990	100.37639
1991	102.28457
1992	93.91816
1993	97.82564
1994	95.17018
1998	101.90499
1999	99.68918
2000	96.05541
2001	99.41438
2002	101.10611
2005	117.68863
2006	104.31594
2007	100.33407
2008	97.59267
2009	94.49245
2010	96.11064
2011	96.4981
2012	97.75764
2013	103.9053
2014	103.42966