Year	kt
1960	36.67
1961	51.338
1962	84.341
1963	88.008
1964	113.677
1965	121.011
1966	139.346
1967	154.014
1968	157.681
1969	161.348
1970	194.351
1971	216.353
1972	227.354
1973	216.353
1974	260.357
1975	289.693
1976	249.356
1977	308.028
1978	410.704
1979	414.371
1980	517.047
1981	535.382
1982	480.377
1983	678.395
1984	601.388
1985	733.4
1986	876.413
1987	971.755
1988	964.421
1989	1030.427
1990	1034.094
1991	1092.766
1992	1081.765
1993	1180.774
1994	1272.449
1995	1232.112
1996	1408.128
1997	1488.802
1998	1558.475
1999	1518.138
2000	1631.815
2001	1686.82
2002	1518.138
2003	1532.806
2004	1716.156
2005	1829.833
2006	1620.814
2007	1364.124
2008	971.755
2009	1708.822
2010	935.085
2011	1144.104
2012	1125.769
2013	982.756
2014	1173.44
2015	1785.829
2016	1749.159