Year	Measure
1971	448.03223
1972	454.0609
1973	447.47951
1974	445.52532
1975	447.90666
1976	460.91352
1977	448.81573
1978	458.60736
1979	443.53999
1980	430.92115
1981	410.79647
1982	391.60225
1983	366.32805
1984	358.25527
1985	361.67141
1986	386.31788
1987	380.60098
1988	373.65895
1989	373.17538
1990	354.19018
1991	351.68971
1992	370.36344
1993	370.61086
1994	367.33449
1995	354.44865
1996	386.06855
1997	382.43502
1998	370.93334
1999	430.97777
2000	406.91039
2001	383.21659
2002	401.9088
2003	373.22436
2004	516.67693
2005	524.55661
2006	505.82036
2007	533.39927
2008	524.7881
2009	470.34199
2010	498.14573
2011	557.60185
2012	589.79416
2013	615.92852
2014	615.80331