Year	Measure
1971	547.17836
1972	541.01768
1973	523.57372
1974	577.94704
1975	593.46571
1976	628.55708
1977	617.94821
1978	774.49162
1979	884.62394
1980	861.98386
1981	896.53399
1982	887.86123
1983	1010.41784
1984	1016.39305
1985	996.74529
1986	1087.91791
1987	1068.50569
1988	1087.70215
1989	1159.35468
1990	1210.3968
1991	1453.77975
1992	1562.13071
1993	1647.42146
1994	1598.62438
1995	1686.69339
1996	1819.56171
1997	2064.46854
1998	1913.80233
1999	1892.21927
2000	2108.60056
2001	2146.88884
2002	2173.29637
2003	2282.2512
2004	2407.06295
2005	2561.60837
2006	2527.96485
2007	2718.08406
2008	2790.46404
2009	2603.93297
2010	2610.30953
2011	2672.12816
2012	2669.14059
2013	2955.79156
2014	2967.5413