Year	kt
1960	10762.645
1961	10703.973
1962	10238.264
1963	9618.541
1964	10128.254
1965	9614.874
1966	8672.455
1967	8122.405
1968	8705.458
1969	9255.508
1970	9493.863
1971	8800.8
1972	8676.122
1973	8595.448
1974	9233.506
1975	7014.971
1976	6626.269
1977	5694.851
1978	6472.255
1979	7102.979
1980	6915.962
1981	5639.846
1982	5210.807
1983	4789.102
1984	5449.162
1985	5434.494
1986	4957.784
1987	4026.366
1988	4158.378
1989	4356.396
1990	4294.057
1991	4052.035
1992	3828.348
1993	3942.025
1994	3432.312
1995	1947.177
1996	1840.834
1997	1184.441
1998	425.372
1999	429.039
2000	476.71
2001	520.714
2002	311.695
2003	242.022
2004	348.365
2005	333.697
2006	396.036
2007	326.363
2008	315.362
2009	289.693
2010	286.026
2011	220.02
2012	205.352
2013	179.683
2014	201.685
2015	187.017
2016	201.685