Year	Measure
1960	2196.95307
1961	2252.77869
1962	2361.74388
1963	2478.91201
1964	2678.38317
1965	2887.69411
1966	3065.43868
1967	3126.42605
1968	3342.70326
1969	3668.5233
1970	3872.22302
1971	3939.21109
1972	4188.16068
1973	4507.55698
1974	4383.84812
1975	4181.81066
1976	4459.85961
1977	4516.24807
1978	4664.52318
1979	4963.53551
1980	5146.6423
1981	4934.58847
1982	4805.49388
1983	4823.85883
1984	4910.52302
1985	5269.89237
1986	5482.57842
1987	5960.69259
1988	5590.43651
1989	5753.63928
1990	5691.57119
1991	5742.78423
1992	5380.99307
1993	5617.21538
1994	5972.55427
1995	5661.90388
1996	6070.21209
1997	6276.95169
1998	6319.3266
1999	6283.95826
2000	6262.19208
2001	6410.62523
2002	6728.58141
2003	7077.02665
2004	7134.85421
2005	6562.02231
2006	7111.85682
2007	6974.89676
2008	6669.17335
2009	6268.30055
2010	6828.78375
2011	6537.6373
2012	6275.77096
2013	6116.22729
2014	6213.35777
2015	5924.70012