Year	Percent
1971	92.88071
1972	94.17301
1973	103.59485
1974	102.55787
1975	102.24349
1976	106.11323
1977	100.9924
1978	98.75715
1979	102.40546
1980	99.81382
1981	103.65465
1982	101.65743
1983	103.11358
1984	109.2661
1985	106.98866
1986	106.0717
1987	105.05766
1988	100.20578
1989	94.59487
1990	99.3524
1991	96.5089
1992	107.59514
1993	106.68197
1994	109.17615
1995	108.88364
1997	97.86086
1998	100.85193
1999	106.202
2000	105.03614
2001	100.57621
2002	95.91059
2003	102.24222
2004	99.98741
2005	97.11768
2006	97.97814
2007	100.47586
2008	99.58237
2009	102.10181
2010	100.7349
2011	103.05364
2012	109.40651
2013	102.66962
2014	94.38574
2015	99.44368