Year	Measure
1971	6394.72203
1972	5971.47346
1973	8495.33456
1974	9009.06272
1975	8000.6453
1976	9584.32363
1977	8188.76227
1978	7844.32086
1979	8814.10627
1980	7794.79449
1981	8295.06308
1982	9071.02474
1983	8502.8881
1984	8833.12256
1985	9921.6532
1986	10261.44107
1987	9523.90901
1988	10493.49745
1989	10248.37349
1990	10555.27079
1991	10108.35385
1992	10837.7268
1993	11142.36134
1994	11555.53615
1995	11408.51944
1996	11109.67083
1997	12181.22132
1998	12406.71042
1999	11851.5266
2000	11988.72127
2001	11738.14599
2002	11548.54941
2003	11566.50028
2004	10894.96269
2005	11675.40667
2006	11604.24931
2007	11234.22155
2008	11318.77551
2009	10339.60097
2010	10207.85148
2011	9911.79634
2012	9657.5687
2013	10416.78989
2014	10593.99714