Year	Measure
1971	403.63549
1972	389.47063
1973	420.83247
1974	459.26926
1975	441.65335
1976	456.17876
1977	498.24114
1978	551.69076
1979	589.37404
1980	618.03525
1981	614.60409
1982	638.33316
1983	642.29931
1984	696.17595
1985	729.37017
1986	781.28118
1987	757.69564
1988	776.48475
1989	821.93181
1990	841.86409
1991	842.28877
1992	753.82434
1993	846.1903
1994	883.97266
1995	895.38541
1996	887.80168
1997	895.86316
1998	874.44425
1999	810.68771
2000	829.39894
2001	850.42517
2002	858.62067
2003	862.51826
2004	898.34411
2005	895.81684
2006	947.12709
2007	974.38686
2008	974.2204
2009	1049.9782
2010	1077.98457
2011	1121.3911
2012	1149.96382
2013	1287.20243
2014	1289.56969