Year	kt
1960	1364.124
1961	2020.517
1962	2016.85
1963	2295.542
1964	3927.357
1965	2838.258
1966	3344.304
1967	3696.336
1968	3674.334
1969	4066.703
1970	4767.1
1971	5537.17
1972	6076.219
1973	8093.069
1974	7400.006
1975	7983.059
1976	7099.312
1977	7282.662
1978	8973.149
1979	8423.099
1980	8375.428
1981	7330.333
1982	6112.889
1983	6310.907
1984	5012.789
1985	4924.781
1986	4429.736
1987	5229.142
1988	4345.395
1989	6512.592
1990	7176.319
1991	7429.342
1992	7300.997
1993	7634.694
1994	7832.712
1995	8771.464
1996	9251.841
1997	9662.545
1998	9251.841
1999	9534.2
2000	9856.896
2001	10175.925
2002	9702.882
2003	10139.255
2004	10091.584
2005	9922.902
2006	11045.004
2007	9259.175
2008	9515.865
2009	7102.979
2010	6688.608
2011	7135.982
2012	6798.618
2013	7352.335
2014	6604.267
2015	6908.628
2016	7576.022