Year	Percent
1972	90.88454
1973	96.86563
1974	96.11248
1976	106.56896
1977	106.58782
1978	110.40822
1979	102.26892
1980	97.1414
1981	97.35481
1983	95.49031
1984	92.0138
1985	93.38051
1986	95.20786
1992	105.13261
1994	103.01421
1995	102.58023
1996	101.66784
1997	102.97583
1998	103.26551
1999	99.61947
2000	94.98412
2001	97.03587
2002	101.96482
2004	109.27934
2006	111.6008
2008	106.1857
2009	105.40799
2011	103.75925
2012	104.08176
2013	103.01003
2015	106.36732