Year	Measure
1971	152.14076
1972	155.3403
1973	152.81981
1974	169.41284
1975	174.72667
1976	165.85294
1977	154.9873
1978	155.73967
1979	155.05387
1980	156.17831
1981	198.46863
1982	221.32286
1983	213.8697
1984	204.98317
1985	224.17859
1986	209.00244
1987	208.29683
1988	210.57275
1989	211.3055
1990	200.167
1991	193.52064
1992	190.1856
1993	192.57175
1994	168.80682
1995	161.72654
1996	167.52975
1997	177.61559
1998	174.81928
1999	180.03086
2000	178.0122
2001	167.8798
2002	157.66354
2003	170.03938
2004	195.76532
2005	189.7732
2006	250.11785
2007	258.37997
2008	272.01554
2009	269.80517
2010	266.34292
2011	261.15416
2012	252.15366
2013	257.11458
2014	280.66668