Year	Measure
1971	7641.88496
1972	7913.63485
1973	7846.63519
1974	7060.32748
1975	6323.89603
1976	6455.75
1977	6562.85171
1978	6743.8109
1979	8023.84658
1980	7617.56969
1981	7136.66059
1982	7585.79223
1983	7704.41935
1984	7609.60556
1985	8066.30328
1986	8271.50463
1987	8506.31971
1988	9894.82487
1989	11237.83365
1990	4338.50873
1991	1322.22507
1995	9183.84926
1996	8915.13967
1997	8566.77961
1998	9142.51127
1999	9206.81367
2000	9126.90876
2001	9470.08967
2002	9582.17781
2003	10096.45349
2004	10583.84403
2005	11544.15553
2006	10795.26875
2007	10491.59147
2008	10825.76517
2009	11142.56073
2010	10699.31686
2011	10147.53446
2012	10953.22445
2013	9708.27302
2014	8956.82031