Year	kt
1960	121.011
1961	150.347
1962	69.673
1963	55.005
1964	172.349
1965	194.351
1966	359.366
1967	979.089
1968	1914.174
1969	1386.126
1970	1983.847
1971	2273.54
1972	2093.857
1973	2313.877
1974	2218.535
1975	2266.206
1976	2511.895
1977	3234.294
1978	4429.736
1979	3384.641
1980	3424.978
1981	3252.629
1982	3237.961
1983	2665.909
1984	2390.884
1985	2159.863
1986	2053.52
1987	1488.802
1988	1686.82
1989	2229.536
1990	847.077
1991	876.413
1992	1037.761
1993	1081.765
1994	707.731
1995	861.745
1996	1015.759
1997	1023.093
1998	1221.111
1999	1059.763
2000	1041.428
2001	1257.781
2002	1184.441
2003	1158.772
2004	1213.777
2005	1400.794
2006	1444.798
2007	1576.81
2008	1602.479
2009	1551.141
2010	1954.511
2011	2189.199
2012	2310.21
2013	2577.901
2014	2493.56
2015	2442.222
2016	2460.557