Year	kt
1960	179.683
1961	223.687
1962	190.684
1963	183.35
1964	359.366
1965	440.04
1966	594.054
1967	612.389
1968	916.75
1969	781.071
1970	1334.788
1971	1503.47
1972	1382.459
1973	2299.209
1974	2416.553
1975	2229.536
1976	2167.197
1977	1866.503
1978	1397.127
1979	1378.792
1980	1653.817
1981	1151.438
1982	1067.097
1983	869.079
1984	902.082
1985	953.42
1986	920.417
1987	1023.093
1988	1026.76
1989	1067.097
1990	1114.768
1991	1254.114
1992	1217.444
1993	1375.125
1994	1404.461
1995	1532.806
1996	1477.801
1997	1477.801
1998	1492.469
1999	1763.827
2000	1532.806
2001	1177.107
2002	1646.483
2003	1884.838
2004	1749.159
2005	2097.524
2006	1936.176
2007	2255.205
2008	2159.863
2009	2159.863
2010	2291.875
2011	2324.878
2012	2339.546
2013	2570.567
2014	3047.277
2015	2819.923
2016	2849.259