Year	kt
1960	29.336
1961	29.336
1962	73.34
1963	55.005
1964	73.34
1965	11.001
1966	201.685
1967	143.013
1968	143.013
1969	165.015
1970	190.684
1971	260.357
1972	220.02
1973	249.356
1974	293.36
1975	300.694
1976	337.364
1977	443.707
1978	542.716
1979	638.058
1980	674.728
1981	-590.387
1982	-572.052
1983	-29.336
1984	656.393
1985	1224.778
1986	1320.12
1987	1191.775
1988	1602.479
1989	1576.81
1990	1540.14
1991	1639.149
1992	1261.448
1993	1606.146
1994	1353.123
1995	1089.099
1996	1195.442
1997	1279.783
1998	1422.796
1999	1547.474
2000	839.743
2001	902.082
2002	718.732
2003	839.743
2004	1008.425
2005	1059.763
2006	971.755
2007	1848.168
2008	2057.187
2009	1756.493
2010	1591.478
2011	1958.178
2012	2068.188
2013	1657.484
2014	1690.487
2015	1646.483
2016	1804.164