Year	kt
1960	685.729
1961	260.357
1962	282.359
1963	355.699
1964	304.361
1965	271.358
1966	300.694
1967	253.023
1968	363.033
1969	1085.432
1970	858.078
1971	803.073
1972	678.395
1973	539.049
1974	520.714
1975	524.381
1976	451.041
1977	513.38
1978	711.398
1979	678.395
1980	608.722
1981	693.063
1982	553.717
1983	689.396
1984	616.056
1985	663.727
1986	674.728
1987	498.712
1988	458.375
1989	374.034
1990	487.711
1991	546.383
1992	451.041
1993	454.708
1994	480.377
1995	374.034
1996	425.372
1997	399.703
1998	396.036
1999	377.701
2000	388.702
2001	513.38
2002	517.047
2003	568.385
2004	553.717
2005	462.042
2006	616.056
2007	517.047
2008	535.382
2009	535.382
2010	575.719
2011	744.401
2012	861.745
2013	1034.094
2014	1140.437
2015	905.749
2016	931.418