Year	Measure
1971	1306.00622
1972	1234.93556
1973	2318.58508
1974	3828.50769
1975	4579.42983
1976	5802.91159
1977	6038.5872
1978	5441.90845
1979	5468.24509
1980	6958.97375
1981	6494.86468
1982	6777.96321
1983	6956.23091
1984	7791.73063
1985	7938.28838
1986	6776.78247
1987	6757.9475
1988	5460.69263
1989	6162.84183
1990	6673.06065
1991	7333.50233
1992	7664.06413
1993	7173.83434
1994	6477.4959
1995	7560.78562
1996	7423.53601
1997	7486.60099
1998	7287.25464
1999	7269.27356
2000	7155.50007
2001	6491.13981
2002	6219.63461
2003	7088.32193
2004	6388.21438
2005	6073.83653
2006	8511.87306
2007	8609.08489
2008	9341.20321
2009	7928.68161
2010	8337.15156
2011	9829.33304
2012	9581.15113
2013	7498.24508
2014	8632.32565