Year	kt
1960	597.721
1961	715.065
1962	671.061
1963	682.062
1964	685.729
1965	704.064
1966	755.402
1967	821.408
1968	1158.772
1969	1111.101
1970	1312.786
1971	1250.447
1972	1441.131
1973	1393.46
1974	1452.132
1975	1521.805
1976	1650.15
1977	1877.504
1978	1914.174
1979	1818.832
1980	1833.5
1981	1668.485
1982	1624.481
1983	1760.16
1984	1719.823
1985	1734.491
1986	1668.485
1987	1950.844
1988	2225.869
1989	2405.552
1990	2266.206
1991	2354.214
1992	2753.917
1993	2489.893
1994	3028.942
1995	3520.32
1996	3487.317
1997	3637.664
1998	4198.715
1999	4103.373
2000	4030.033
2001	4726.763
2002	5108.131
2003	5687.517
2004	6211.898
2005	6380.58
2006	6461.254
2007	7565.021
2008	7334
2009	6538.261
2010	6747.28
2011	7315.665
2012	7594.357
2013	7880.383
2014	8093.069
2015	8874.14
2016	8533.109