Year	Percent
1971	109.06696
1972	111.29233
1973	105.5891
1974	106.38001
1975	93.76907
1976	72.98791
1977	95.4698
1978	90.97278
1979	100.38168
1980	104.70866
1981	118.16106
1982	104.33031
1983	100.85753
1984	96.93494
1985	103.08338
1986	103.66268
1987	108.34945
1988	99.56777
1989	101.2116
1990	100.25476
1991	98.53292
1992	101.62811
1993	104.97932
1994	104.74952
1995	100.64426
1996	101.37895
1997	100.22851
1998	102.12578
1999	104.77127
2000	107.99639
2001	106.3379
2002	106.2753
2003	103.73051
2004	100.33708
2005	95.90411
2006	98.32636
2007	95.28449
2008	98.12915
2009	92.24174
2010	97.32866
2011	99.6543
2012	93.1305
2013	96.44521
2014	101.23301
2015	99.28662
2016	101.65017