Year	Measure
1971	666.07486
1972	648.808
1973	658.31892
1974	678.35218
1975	679.91458
1976	672.42446
1977	678.50924
1978	641.41797
1979	622.80873
1980	648.52101
1981	636.64554
1982	632.72538
1983	568.24488
1984	568.78988
1985	541.32043
1986	538.88826
1987	540.97437
1988	520.40017
1989	469.98569
1990	445.98055
1991	428.52211
1992	408.43313
1993	427.60889
1994	434.80119
1995	456.3958
1996	462.3251
1997	440.55803
1998	456.55964
1999	479.5173
2000	471.60814
2001	449.14127
2002	446.34076
2003	432.02785
2004	472.06627
2005	494.18763
2006	474.01111
2007	506.67157
2008	524.93249
2009	543.48431
2010	635.49159
2011	638.44247
2012	677.96907
2013	666.43278
2014	767.68951