Year	Measure
1971	492.39644
1972	487.96442
1973	513.14715
1974	522.27669
1975	526.55157
1976	548.12241
1977	585.04119
1978	548.51642
1979	448.89536
1980	472.24662
1981	471.54504
1982	469.26889
1983	476.35999
1984	510.5432
1985	520.70871
1986	508.65689
1987	502.38286
1988	464.81275
1989	487.67171
1990	487.16765
1991	505.71245
1992	509.83948
1993	490.88913
1994	485.78093
1995	489.80384
1996	489.41527
1997	503.04472
1998	497.21991
1999	496.19206
2000	500.64375
2001	497.68975
2002	508.74078
2003	513.80083
2004	530.30348
2005	531.93298
2006	520.11344
2007	521.87227
2008	520.87083
2009	517.26623
2010	515.21292
2011	526.60482
2012	559.27184
2013	591.87954
2014	609.00712