Year	Measure
1971	505.40129
1972	573.37287
1973	586.31507
1974	600.94496
1975	598.22211
1976	602.92331
1977	601.95201
1978	602.62646
1979	611.58214
1980	591.23756
1981	597.86903
1982	596.93329
1983	620.7953
1984	639.76461
1985	521.88737
1986	530.47909
1987	588.6271
1988	552.19028
1989	533.76681
1990	558.88464
1991	552.429
1992	600.9005
1993	571.46949
1994	644.41487
1995	664.86502
1996	682.13749
1997	748.65425
1998	778.52869
1999	797.02109
2000	843.16276
2001	805.08113
2002	841.27143
2003	784.21445
2004	698.73145
2005	748.54675
2006	763.91664
2007	766.07435
2008	757.67933
2009	733.5581
2010	760.7702
2011	764.80097
2012	797.40156
2013	742.47206
2014	734.4079