Year	Measure
1971	665.27196
1972	844.6724
1973	866.41555
1974	901.2078
1975	975.73818
1976	1037.68052
1977	949.72341
1978	886.44468
1979	925.48315
1980	976.38638
1981	977.26838
1982	965.61099
1983	907.24896
1984	852.1738
1985	959.47999
1986	893.36195
1987	900.97332
1988	880.02231
1989	906.13115
1990	886.56583
1991	875.60685
1992	803.24872
1993	749.87924
1994	787.7162
1995	829.56828
1996	869.05472
1997	897.01133
1998	865.53137
1999	908.28185
2000	872.83431
2001	840.84273
2002	839.96472
2003	834.26357
2004	805.00811
2005	832.37816
2006	807.58796
2007	698.95451
2008	573.29482
2009	531.04141
2010	546.84273
2011	570.25093
2012	542.72955
2013	557.57393
2014	536.99549