Year	Measure
1971	704.69574
1972	944.21029
1973	1068.84816
1974	1142.27313
1975	1385.47502
1976	1206.79777
1977	1442.25839
1978	1572.61287
1979	1695.6508
1980	2189.46092
1981	2273.95131
1982	2377.05397
1983	2337.04393
1984	2419.91585
1985	2615.65767
1986	2524.67549
1987	2678.72204
1988	2507.28506
1989	2653.98781
1990	2517.10194
1991	2493.07516
1992	2423.62466
1993	2460.34931
1994	2720.99523
1995	2826.19517
1996	2950.19425
1997	2951.23493
1998	2942.05834
1999	2859.84734
2000	2955.26323
2001	2997.34219
2002	3068.15793
2003	3107.05487
2004	3144.40838
2005	3068.18061
2006	3055.24672
2007	2798.52779
2008	2940.38174
2009	3152.83122
2010	3369.0328
2011	2209.88969
2012	2782.74831
2013	3133.48806
2014	2880.14393