Year	Measure
1971	735.57825
1972	705.14139
1973	691.76074
1974	669.1176
1975	645.76189
1976	619.44589
1977	612.01949
1978	579.02341
1979	566.22041
1980	567.17364
1981	540.1397
1982	528.11416
1983	512.1962
1984	497.54259
1985	490.3396
1986	483.36289
1987	478.98261
1988	473.91847
1989	466.8656
1990	447.02498
1991	433.66804
1992	424.23723
1993	415.82729
1994	404.18836
1995	398.77311
1996	393.98465
1997	394.69795
1998	388.48938
1999	386.05588
2000	396.98922
2001	405.97984
2002	399.44355
2003	408.92055
2004	412.28753
2005	405.71269
2006	405.72187
2007	410.92798
2008	406.82604
2009	409.7032
2010	411.21281
2011	415.43955
2012	411.05203
2013	413.53402
2014	427.59836