Year	kt
1960	352.032
1961	377.701
1962	414.371
1963	396.036
1964	396.036
1965	421.705
1966	432.706
1967	678.395
1968	982.756
1969	1026.76
1970	20513.198
1971	17377.913
1972	17704.276
1973	17359.578
1974	9948.571
1975	9266.509
1976	2152.529
1977	2277.207
1978	2863.927
1979	3292.966
1980	3755.008
1981	4158.378
1982	4404.067
1983	4818.438
1984	5203.473
1985	5595.842
1986	5724.187
1987	6406.249
1988	7964.724
1989	7385.338
1990	9123.496
1991	8045.398
1992	8723.793
1993	12119.435
1994	13212.201
1995	13197.533
1996	15995.454
1997	18412.007
1998	19061.066
1999	20252.841
2000	23212.11
2001	25584.659
2002	28661.272
2003	29526.684
2004	33919.75
2005	33886.747
2006	32438.282
2007	37388.732
2008	40454.344
2009	43376.943
2010	49343.152
2011	47216.292
2012	44246.022
2013	43490.62
2014	46735.915
2015	50963.966
2016	52559.111