Year	kt
1960	352.032
1961	432.706
1962	407.037
1963	319.029
1964	337.364
1965	297.027
1966	377.701
1967	421.705
1968	421.705
1969	748.068
1970	465.709
1971	480.377
1972	432.706
1973	583.053
1974	586.72
1975	715.065
1976	476.71
1977	561.051
1978	476.71
1979	524.381
1980	524.381
1981	539.049
1982	594.054
1983	480.377
1984	381.368
1985	704.064
1986	663.727
1987	601.388
1988	975.422
1989	689.396
1990	542.716
1991	968.088
1992	1048.762
1993	1580.477
1994	1246.78
1995	1393.46
1996	1316.453
1997	1265.115
1998	1466.8
1999	1411.795
2000	1972.846
2001	2060.854
2002	2797.921
2003	2768.585
2004	3252.629
2005	3421.311
2006	2871.261
2007	3608.328
2008	3391.975
2009	3058.278
2010	3303.967
2011	3131.618
2012	2900.597
2013	3373.64
2014	3050.944
2015	3091.281
2016	3215.959