Year	Measure
1971	1292.24147
1972	1569.47082
1973	1711.83584
1974	1795.97901
1975	1640.48838
1976	1693.24729
1977	1763.23012
1978	2214.63035
1979	2130.84246
1980	2125.96683
1981	2124.85338
1982	1987.08731
1983	2195.89036
1984	2455.48438
1985	2472.96833
1986	2630.75438
1987	2757.88069
1988	2981.12861
1989	2896.50009
1990	3782.72028
1991	4167.36558
1992	4588.84551
1993	5487.60892
1994	6460.48198
1995	5346.87556
1996	5359.4098
1997	5818.34903
1998	5083.24962
1999	4587.49349
2000	4634.72585
2001	5145.88575
2002	5065.98451
2003	6216.73918
2004	7370.65288
2005	5055.96632
2006	5264.39866
2007	4677.20431
2008	5094.13571
2009	4257.77628
2010	5006.62099
2011	5069.17179
2012	4898.33046
2013	4880.40607
2014	5121.80432