Year	Measure
1971	1870.10916
1972	1756.331
1973	2368.43685
1974	1732.93337
1975	2032.7644
1976	1832.14803
1977	1786.48768
1978	1849.39919
1979	2005.81352
1980	2017.27695
1981	1840.73534
1982	1958.31704
1983	1793.92205
1984	1828.53907
1985	1788.99669
1986	2102.24587
1987	2278.47929
1988	2451.74584
1989	2488.92342
1990	2460.46545
1991	2324.5393
1992	2580.96935
1993	2634.67402
1994	2738.3997
1995	2796.25158
1996	2801.20836
1997	2881.12834
1998	2885.72651
1999	2737.73665
2000	2899.42662
2001	2973.04271
2002	2862.79574
2003	2949.30042
2004	2821.99692
2005	2661.44919
2006	2882.39902
2007	2898.15337
2008	3129.12776
2009	2873.87611
2010	3042.43402
2011	2980.17616
2012	3067.74249
2013	2870.09877
2014	2762.50593
2015	2777.87532