Year	Measure
1971	50.77255
1972	49.91787
1973	56.88074
1974	67.28746
1975	55.10178
1976	60.84869
1977	56.41434
1978	59.74371
1979	36.34797
1980	36.46083
1981	36.01725
1982	47.62579
1983	37.21053
1984	29.0187
1985	30.96022
1986	36.44207
1987	41.54871
1988	33.91642
1989	38.89855
1990	41.36583
1991	54.66463
1992	53.08704
1993	49.73698
1994	43.50385
1995	45.37052
1996	45.05106
1997	53.46873
1998	48.14207
1999	67.89928
2000	123.14803
2001	271.88476
2002	260.55847
2003	367.15259
2004	440.02017
2005	441.76118
2006	449.05519
2007	449.15387
2008	432.35894
2009	431.89818
2010	440.39559
2011	440.67516
2012	445.38597
2013	436.13671
2014	462.62029