Year	Measure
1971	2288.69339
1972	2497.14104
1973	2497.55949
1974	2518.21143
1975	2624.89146
1976	2718.08661
1977	2831.99557
1978	3011.92412
1979	3049.3925
1980	3022.17638
1981	3067.49242
1982	3173.90226
1983	3313.27649
1984	3359.46141
1985	3485.23506
1986	3407.07141
1987	3756.46601
1988	4026.11436
1989	4228.41965
1990	4176.18026
1991	3981.20832
1992	4568.41694
1993	4618.89375
1994	4934.24708
1995	5127.86294
1996	5340.30218
1997	5488.51953
1998	5819.46073
1999	5974.36735
2000	6323.10383
2001	6400.21743
2002	6502.73973
2003	6597.30631
2004	6525.92157
2005	6572.19954
2006	6711.22957
2007	7003.24508
2008	7134.00285
2009	6607.88714
2010	6953.27667
2011	6930.00077
2012	7184.50161
2013	6710.09368
2014	6600.89828