Year	Measure
1960	10523.40669
1961	10534.01821
1962	10414.54092
1963	10465.81302
1964	11150.05034
1965	10926.39517
1966	10480.60618
1967	10361.97257
1968	11114.66726
1969	11974.19259
1970	12106.15294
1971	11863.08959
1972	12009.57011
1973	12648.56042
1974	13023.88959
1975	10504.9812
1976	10668.56744
1977	10278.55755
1978	11096.00367
1979	10458.11286
1980	9774.65056
1981	8526.03737
1982	8057.81
1983	7576.20712
1984	8112.67548
1985	8346.92642
1986	8163.54875
1987	7942.94808
1988	8158.43353
1989	8699.93636
1990	8874.10502
1991	9353.42119
1992	9262.08198
1993	9266.94258
1994	8823.25247
1995	7705.40716
1996	7711.17871
1997	7409.851
1998	7066.88486
1999	7266.97253
2000	7676.83704
2001	7982.85035
2002	8204.72684
2003	8549.50291
2004	9387.4371
2005	9428.81129
2006	9170.53257
2007	8773.8967
2008	8612.23371
2009	7951.72394
2010	8329.47828
2011	8056.4043
2012	7722.1902
2013	7312.154
2014	6861.10667
2015	6548.40556