Year	kt
1960	4497.692319016887
1961	4235.124334987794
1962	3418.246162452835
1963	3408.5214223036087
1964	4468.518098569211
1965	3992.0058312571527
1966	4177.908063595109
1967	4838.35020479574
1968	4740.605756214009
1969	5918.426361623881
1970	6740.1582862129835
1971	6422.226291580295
1972	7981.3512436458295
1973	8372.593951667684
1974	9746.833963594449
1975	12128.523948677484
1976	9913.112114503734
1977	10108.733468514662
1978	9683.257023540897
1979	9737.052895893901
1980	10446.180304183512
1981	11858.883209147965
1982	13921.722745116816
1983	14596.774656159021
1984	16000.68696390622
1985	15350.093455438007
1986	17786.15035180771
1987	19131.362493377328
1988	18705.786288589847
1989	18647.070767935104
1990	18025.66484100575
1991	19219.547094318834
1992	17140.039071130064
1993	19415.26549650131
1994	20999.597250666848
1995	20116.21227258667
1996	23328.084828758627
1997	22238.256622105357
1998	25020.441277290967
1999	24607.197960631274
2000	27879.50840999466
2001	29542.091986323194
2002	31555.451866327978
2003	31276.752885324928
2004	31965.689370630145
2005	34336.01629909285
2006	35270.6574050314
2007	36942.412372869934
2008	34653.98698461834
2009	29567.119221657616
2010	32764.989907703613
2011	26986.028335429422
2012	25557.384447712604
2013	24541.03376249124
2014	29283.062920114407
2015	30903.52399721119
2016	29240.028770674424