Year	Measure
1971	4091.21441
1972	4312.50423
1973	4478.87171
1974	4576.98297
1975	4640.27788
1976	4665.35921
1977	4623.34152
1978	4725.59845
1979	4815.65901
1980	4877.02731
1981	4857.73301
1982	4950.00033
1983	4961.66288
1984	4574.17402
1985	4230.21262
1986	3438.96975
1987	3829.49503
1988	3939.59291
1989	4253.52362
1990	4662.99862
1991	4771.36902
1992	5162.87731
1993	5537.11391
1994	5883.97981
1995	6090.71304
1996	6301.86048
1997	6280.79153
1998	6769.47782
1999	7000.02869
2000	7291.19976
2001	7222.17487
2002	7282.99988
2003	7521.02019
2004	7571.24121
2005	7613.07007
2006	7243.04194
2007	7323.54085
2008	7149.71209
2009	7423.39937
2010	7471.26823
2011	7379.11968
2012	5062.85835
2013	4934.27468
2014	4797.67044