Year	Measure
1960	873.91031
1961	962.90711
1962	1003.75225
1963	1136.48487
1964	1260.47455
1965	1361.58724
1966	1476.99749
1967	1720.54974
1968	1938.45683
1969	2193.61013
1970	2458.35709
1971	2531.08854
1972	2667.04675
1973	2964.20822
1974	2924.24571
1975	2725.15933
1976	2876.80085
1977	2899.90422
1978	2898.33881
1979	3044.05284
1980	2950.13535
1981	2864.36865
1982	2840.60844
1983	2823.8771
1984	3017.8152
1985	3005.2381
1986	3020.56048
1987	3044.11509
1988	3242.67869
1989	3350.72629
1990	3551.16177
1991	3575.24609
1992	3649.94432
1993	3664.56836
1994	3850.96244
1995	3935.99475
1996	4008.47624
1997	4041.16767
1998	3955.62763
1999	4011.22478
2000	4083.8317
2001	4008.26803
2002	3991.97757
2003	3953.18451
2004	4078.21054
2005	4062.97905
2006	4053.88344
2007	4012.65424
2008	3858.43452
2009	3678.51113
2010	3893.2666
2011	3610.81217
2012	3537.36317
2013	3567.62935
2014	3470.76313
2015	3428.55722