Year	kt
1960	3942.025
1961	3802.679
1962	3718.338
1963	4030.033
1964	4272.055
1965	5203.473
1966	5071.461
1967	4569.082
1968	4539.746
1969	5287.814
1970	5434.494
1971	5485.832
1972	5757.19
1973	5441.828
1974	5335.485
1975	5573.84
1976	5489.499
1977	5243.81
1978	5394.157
1979	5922.205
1980	5423.493
1981	4998.121
1982	4536.079
1983	3611.995
1984	3281.965
1985	3138.952
1986	3010.607
1987	3355.305
1988	4587.417
1989	4602.085
1990	3744.007
1991	4305.058
1992	4917.447
1993	4217.05
1994	3714.671
1995	4290.39
1996	5100.797
1997	5159.469
1998	5243.81
1999	6292.572
2000	4895.445
2001	4517.744
2002	4077.704
2003	3956.693
2004	5104.464
2005	5276.813
2006	6120.223
2007	5489.499
2008	7781.374
2009	7411.007
2010	5819.529
2011	7124.981
2012	8140.74
2013	7055.308
2014	6233.9
2015	6233.9
2016	6274.237