Year	Measure
1971	539.75709
1972	540.58879
1973	571.37598
1974	553.28227
1975	528.1154
1976	547.69689
1977	580.53094
1978	631.20376
1979	623.46137
1980	655.4233
1981	636.17331
1982	630.6502
1983	626.71804
1984	620.0672
1985	615.16777
1986	622.94088
1987	699.10224
1988	726.93124
1989	770.89001
1990	729.2193
1991	733.72477
1992	712.69166
1993	722.22716
1994	770.8221
1995	824.55822
1996	824.76234
1997	877.04524
1998	847.18302
1999	791.64573
2000	726.27039
2001	724.96275
2002	705.43427
2003	707.14646
2004	701.88999
2005	683.2006
2006	693.56799
2007	708.78299
2008	732.88412
2009	732.69034
2010	774.22065
2011	774.70323
2012	783.32834
2013	764.12909
2014	788.68962