Year	Measure
1971	272.52277
1972	286.852
1973	315.93842
1974	323.83346
1975	365.18272
1976	456.7441
1977	455.17351
1978	543.70324
1979	542.47746
1980	641.12656
1981	770.30164
1982	842.44749
1983	877.7647
1984	926.23546
1985	903.80682
1986	932.42121
1987	951.89386
1988	907.19046
1989	875.39643
1990	919.50164
1991	901.57144
1992	958.0336
1993	898.89415
1994	918.4368
1995	940.65303
1996	935.76123
1997	933.04861
1998	946.11166
1999	926.80451
2000	953.46993
2001	927.5461
2002	956.9495
2003	958.59415
2004	1123.2919
2005	1168.39995
2006	1154.9267
2007	1164.01496
2008	1089.23989
2009	1093.36639
2010	988.98333
2011	932.80068
2012	982.14155
2013	918.45677
2014	928.52048