Year	Measure
1971	180.74186
1972	190.65968
1973	206.7025
1974	219.38387
1975	222.47339
1976	235.0247
1977	252.50163
1978	261.42237
1979	272.30254
1980	270.07419
1981	264.75944
1982	268.96017
1983	273.13693
1984	275.17458
1985	274.22048
1986	276.78618
1987	278.18057
1988	286.34799
1989	305.10654
1990	306.21936
1991	315.98463
1992	328.80422
1993	335.42227
1994	353.42851
1995	344.88931
1996	357.38174
1997	363.55092
1998	365.9284
1999	384.42271
2000	381.9412
2001	400.27771
2002	402.29842
2003	396.07975
2004	464.6798
2005	486.35762
2006	489.01078
2007	498.59711
2008	511.63377
2009	508.9912
2010	527.02438
2011	560.10935
2012	559.92777
2013	554.1448
2014	553.10396