Year	Measure
1971	73.83003
1972	74.69425
1973	80.18105
1974	79.75265
1975	83.05969
1976	86.48138
1977	91.72298
1978	97.26702
1979	102.05374
1980	102.81359
1981	105.90682
1982	95.77607
1983	105.23736
1984	109.70967
1985	103.93635
1986	101.40351
1987	103.13472
1988	104.24909
1989	100.29201
1990	103.23445
1991	102.18684
1992	108.72103
1993	103.84216
1994	109.37278
1995	108.61356
1996	109.31486
1997	116.67447
1998	121.25211
1999	117.35487
2000	101.67895
2001	123.3411
2002	145.71706
2003	125.94895
2004	138.46365
2005	157.93778
2006	157.13743
2007	181.15886
2008	158.30931
2009	189.06985
2010	199.12933
2011	199.68559
2012	210.74888
2013	210.19354
2014	223.49616