Year	Measure
1971	732.00935
1972	695.74426
1973	705.1534
1974	702.88651
1975	762.14449
1976	806.28444
1977	846.66122
1978	918.64786
1979	934.03954
1980	1003.84872
1981	1037.12527
1982	1037.81562
1983	1038.85604
1984	1041.21939
1985	1071.41387
1986	1106.2217
1987	1159.35719
1988	1253.13651
1989	1206.22185
1990	1244.37739
1991	1344.80612
1992	1365.83139
1993	1454.61754
1994	1486.44103
1995	1578.0804
1996	1635.75824
1997	1731.57526
1998	1806.72864
1999	1914.59388
2000	2030.26275
2001	2000.23865
2002	1997.73242
2003	1884.45101
2004	1928.94549
2005	1999.63195
2006	2220.926
2007	2413.3608
2008	2586.22954
2009	2659.72395
2010	2803.15255
2011	2808.34493
2012	2931.01372
2013	2985.03083
2014	3067.95113