Year	kt
1960	2522607.3952019243
1961	2265621.459189504
1962	2165470.5596357407
1963	2235126.943571282
1964	2289147.291371995
1965	2395062.16741269
1966	2489671.74154649
1967	2419543.793648817
1968	2474753.787879559
1969	2625745.847901665
1970	2898810.125513467
1971	3032442.3877190887
1972	3149877.5009094235
1973	3196954.9016239033
1974	3224228.569938839
1975	3483203.417753975
1976	3565470.765622634
1977	3739867.175769785
1978	3894170.677446979
1979	3988058.8941162415
1980	4102141.9481962896
1981	3955057.966740062
1982	4164316.246452053
1983	4299168.0806489745
1984	4506119.835002649
1985	4957706.10136244
1986	5141693.874512286
1987	5342682.765821422
1988	5530376.920091278
1989	5478612.808302268
1990	5202159.609458608
1991	5177789.04473822
1992	4679628.121065807
1993	4729764.8056906415
1994	4799591.248472536
1995	5010053.8880419275
1996	5147320.35290511
1997	5029602.9580546925
1998	4799594.594117269
1999	4789046.657972696
2000	4843468.932023842
2001	4889567.132052296
2002	5271046.863429446
2003	5961881.771588313
2004	6591988.072317464
2005	7273534.70443378
2006	7938742.912866774
2007	8114968.668687539
2008	9088704.573527751
2009	8885064.8991222
2010	9944722.791353123
2011	10965449.188310789
2012	11345846.753986659
2013	11191020.09388603
2014	11215241.65643852
2015	11189098.165553058
2016	10970530.1642917