Year	kt
1960	176.016
1961	161.348
1962	190.684
1963	194.351
1964	154.014
1965	168.682
1966	154.014
1967	216.353
1968	242.022
1969	304.361
1970	300.694
1971	337.364
1972	381.368
1973	462.042
1974	513.38
1975	418.038
1976	1199.109
1977	1591.478
1978	1499.803
1979	1404.461
1980	1606.146
1981	2225.869
1982	2456.89
1983	2618.238
1984	2519.229
1985	2291.875
1986	2357.881
1987	2273.54
1988	2251.538
1989	2643.907
1990	2735.582
1991	3050.944
1992	4723.096
1993	4855.108
1994	4605.752
1995	5614.177
1996	5632.512
1997	9031.821
1998	11873.746
1999	8500.106
2000	9820.226
2001	15570.082
2002	14649.665
2003	13435.888
2004	8808.134
2005	10861.654
2006	18687.032
2007	12497.136
2008	14425.978
2009	14778.01
2010	15214.383
2011	10131.921
2012	8291.087
2013	11789.405
2014	4429.736
2015	2680.577
2016	2497.227