Year	Measure
1971	26.07966
1972	27.40517
1973	32.30046
1974	37.23553
1975	38.41133
1976	39.03613
1977	39.9709
1978	41.62854
1979	40.84795
1980	36.71659
1981	33.96482
1982	35.01394
1983	32.90725
1984	43.93431
1985	46.80043
1986	51.68548
1987	52.20537
1988	45.85255
1989	42.904
1990	49.74585
1991	47.59016
1992	47.23875
1993	44.85477
1994	45.97916
1995	45.14884
1996	45.47415
1997	42.52713
1998	41.19289
1999	60.73026
2000	62.40534
2001	52.21821
2002	60.94576
2003	64.2277
2004	64.52657
2005	75.87944
2006	84.25704
2007	90.54622
2008	98.42318
2009	112.82161
2010	131.05527
2011	141.64534
2012	156.94234
2013	158.65867
2014	190.22089