Year	kt
1960	1716.156
1961	1837.167
1962	1906.84
1963	1969.179
1964	2192.866
1965	2277.207
1966	2464.224
1967	2988.605
1968	2599.903
1969	2592.569
1970	3527.654
1971	3934.691
1972	3802.679
1973	3160.954
1974	3556.99
1975	3175.622
1976	3622.996
1977	3824.681
1978	3655.999
1979	3784.344
1980	4030.033
1981	4411.401
1982	4121.708
1983	4279.389
1984	4737.764
1985	4316.059
1986	4206.049
1987	2390.884
1988	1690.487
1989	1917.841
1990	2046.186
1991	2020.517
1992	2907.931
1993	3083.947
1994	3454.314
1995	3832.015
1996	3912.689
1997	3890.687
1998	4679.092
1999	5427.16
2000	5782.859
2001	4723.096
2002	5416.159
2003	5889.202
2004	6274.237
2005	5265.812
2006	5460.163
2007	5562.839
2008	5159.469
2009	3857.684
2010	7499.015
2011	7700.7
2012	6266.903
2013	7165.318
2014	9684.547
2015	10043.913
2016	14502.985