Year	kt
1960	1257.781
1961	766.403
1962	407.037
1963	253.023
1964	282.359
1965	264.024
1966	271.358
1967	190.684
1968	201.685
1969	451.041
1970	971.755
1971	902.082
1972	649.059
1973	821.408
1974	700.397
1975	792.072
1976	586.72
1977	605.055
1978	572.052
1979	894.748
1980	1609.813
1981	1910.507
1982	1976.513
1983	3149.953
1984	4030.033
1985	3080.28
1986	2728.248
1987	2970.27
1988	2977.604
1989	2988.605
1990	2944.601
1991	2691.578
1992	2379.883
1993	1925.175
1994	2288.208
1995	1936.176
1996	1408.128
1997	1382.459
1998	2112.192
1999	2174.531
2000	1969.179
2001	2097.524
2002	2610.904
2003	2790.587
2004	1925.175
2005	2365.215
2006	2702.579
2007	3014.274
2008	3010.607
2009	1595.145
2010	1217.444
2011	1048.762
2012	1037.761
2013	726.066
2014	546.383
2015	502.379
2016	0