Year	Measure
1971	465.32105
1972	484.99313
1973	500.10901
1974	499.32321
1975	544.92788
1976	615.58445
1977	621.96499
1978	645.49715
1979	617.85598
1980	549.90543
1981	584.64236
1982	594.80122
1983	563.70701
1984	567.61672
1985	532.98469
1986	456.85729
1987	503.29955
1988	463.60769
1989	469.12972
1990	469.78468
1991	509.57514
1992	524.65691
1993	544.84289
1994	569.6713
1995	598.60117
1996	565.95301
1997	620.23358
1998	632.3921
1999	650.96125
2000	676.10563
2001	702.75681
2002	712.34952
2003	739.7294
2004	730.13286
2005	747.65669
2006	781.65643
2007	736.18384
2008	736.077
2009	686.3967
2010	689.42998
2011	692.95057
2012	679.14402
2013	638.13091
2014	647.30961