Year	Measure
1971	464.93316
1972	477.16871
1973	483.71738
1974	486.16799
1975	527.48834
1976	537.17473
1977	577.21101
1978	617.1549
1979	619.04366
1980	609.4552
1981	597.14671
1982	606.83044
1983	621.91072
1984	651.07496
1985	657.75974
1986	671.2095
1987	694.42236
1988	720.3415
1989	724.11611
1990	766.99533
1991	736.8518
1992	752.62866
1993	788.12872
1994	816.16289
1995	866.83437
1996	881.65374
1997	871.75632
1998	869.35861
1999	878.52454
2000	898.98731
2001	928.81143
2002	984.81071
2003	1118.43177
2004	1268.1329
2005	1393.69132
2006	1515.17368
2007	1630.17103
2008	1672.90412
2009	1778.43352
2010	1954.72256
2011	2086.4869
2012	2155.16479
2013	2213.75933
2014	2236.72991