Year	kt
1960	179.683
1961	179.683
1962	212.686
1963	201.685
1964	150.347
1965	150.347
1966	135.679
1967	106.343
1968	88.008
1969	77.007
1970	84.341
1971	77.007
1972	77.007
1973	62.339
1974	113.677
1975	150.347
1976	172.349
1977	722.399
1978	883.747
1979	1100.1
1980	1349.456
1981	1294.451
1982	1609.813
1983	2200.2
1984	3564.324
1985	3641.331
1986	2933.6
1987	3457.981
1988	3938.358
1989	3333.303
1990	3608.328
1991	4132.709
1992	4228.051
1993	4195.048
1994	4184.047
1995	4697.427
1996	5907.537
1997	6794.951
1998	6864.624
1999	11884.747
2000	16314.483
2001	16376.822
2002	14308.634
2003	14869.685
2004	16112.798
2005	18789.708
2006	17795.951
2007	21906.658
2008	25474.649
2009	24682.577
2010	28254.235
2011	31041.155
2012	32471.285
2013	40058.308
2014	42764.554
2015	46457.223
2016	45991.514