Year	Measure
1960	1922.97367
1961	2023.30839
1962	2296.28956
1963	2502.92764
1964	2600.15582
1965	2822.73484
1966	3067.42783
1967	3061.11011
1968	3203.75228
1969	3699.53044
1970	3971.43073
1971	3728.53802
1972	3858.59212
1973	3781.7572
1974	3489.60646
1975	3453.20722
1976	3745.56184
1977	3830.10381
1978	3894.63776
1979	4020.03654
1980	3735.14409
1981	3381.43445
1982	3422.3748
1983	3233.1601
1984	3353.4612
1985	3774.10113
1986	3823.50181
1987	3819.83213
1988	3642.11965
1989	3414.21161
1990	3376.78331
1991	3734.8184
1992	3561.89037
1993	3645.51535
1994	3760.57724
1995	3706.44019
1996	4170.25202
1997	3848.15584
1998	3772.11028
1999	3602.67064
2000	3489.6148
2001	3583.95572
2002	3535.09801
2003	3727.83418
2004	3597.17296
2005	3487.63191
2006	3728.17104
2007	3622.59683
2008	3501.51385
2009	3329.21107
2010	3510.79685
2011	3230.18803
2012	3091.58158
2013	3125.33776
2014	2872.57355
2015	2816.61457