Year	Measure
1971	1016.46847
1972	1000.90826
1973	1024.52749
1974	1003.87388
1975	967.51186
1976	990.11493
1977	932.83125
1978	899.04615
1979	886.81237
1980	906.25309
1981	885.97607
1982	859.26893
1983	847.2847
1984	829.48576
1985	855.26462
1986	872.39852
1987	920.05936
1988	901.41616
1989	893.87965
1990	913.00813
1991	943.71842
1992	952.61273
1993	892.72977
1994	869.48972
1995	869.332
1996	850.80145
1997	828.5453
1998	834.75943
1999	877.59157
2000	818.87952
2001	807.16981
2002	784.47681
2003	742.31356
2004	717.12002
2005	743.13356
2006	750.19633
2007	723.93292
2008	661.31478
2009	661.58666
2010	671.49894
2011	712.58317
2012	734.83664
2013	749.66711