Year	kt
1960	113.677
1961	113.677
1962	110.01
1963	165.015
1964	161.348
1965	194.351
1966	245.689
1967	256.69
1968	231.021
1969	234.688
1970	154.014
1971	249.356
1972	275.025
1973	377.701
1974	693.063
1975	781.071
1976	916.75
1977	1133.103
1978	1485.135
1979	1631.815
1980	1884.838
1981	1686.82
1982	2383.55
1983	3380.974
1984	4173.046
1985	4998.121
1986	5991.878
1987	6644.604
1988	6846.289
1989	7311.998
1990	7425.675
1991	7264.327
1992	7803.376
1993	8522.108
1994	8841.137
1995	9486.529
1996	10630.633
1997	11800.406
1998	12383.459
1999	13923.599
2000	18023.305
2001	22900.415
2002	28349.577
2003	29211.322
2004	36097.948
2005	38279.813
2006	40072.976
2007	40579.022
2008	48569.415
2009	39156.226
2010	52702.124
2011	50523.926
2012	59874.776
2013	71136.133
2014	78096.099
2015	77241.688
2016	66116.01