Year	Measure
1971	425.63739
1972	443.19298
1973	470.50196
1974	449.01642
1975	474.43391
1976	466.44639
1977	529.17189
1978	557.84691
1979	561.28584
1980	525.97737
1981	480.84106
1982	456.38093
1983	437.04154
1984	461.65643
1985	462.93009
1986	473.03842
1987	491.57043
1988	491.20802
1989	533.36469
1990	541.8074
1991	560.47882
1992	705.48703
1993	701.86746
1994	674.41362
1995	671.48781
1996	658.257
1997	651.0535
1998	632.76426
1999	683.02213
2000	732.04069
2001	723.26723
2002	748.47633
2003	791.1248
2004	923.56601
2005	910.04607
2006	970.73706
2007	1031.80776
2008	1035.29692
2009	1016.18466
2010	1022.18059
2011	1011.85095
2012	1016.80575
2013	1029.01049
2014	1031.1415