Year	kt
1960	2141.528
1961	2141.528
1962	2332.212
1963	2570.567
1964	2526.563
1965	2082.856
1966	2310.21
1967	2332.212
1968	2442.222
1969	2724.581
1970	2467.891
1971	3072.946
1972	3366.306
1973	3333.303
1974	4349.062
1975	4407.734
1976	3949.359
1977	4316.059
1978	4627.754
1979	4572.749
1980	5518.835
1981	5639.846
1982	3956.693
1983	3780.677
1984	3424.978
1985	3116.95
1986	3281.965
1987	4272.055
1988	3868.685
1989	4235.385
1990	4668.091
1991	3777.01
1992	4367.397
1993	5291.481
1994	5540.837
1995	6406.249
1996	8071.067
1997	7271.661
1998	9130.83
1999	9259.175
2000	9669.879
2001	8536.776
2002	6970.967
2003	5683.85
2004	6446.586
2005	7172.652
2006	8045.398
2007	8159.075
2008	8419.432
2009	10329.939
2010	9695.548
2011	10208.928
2012	9292.178
2013	9801.891
2014	10252.932
2015	12530.139
2016	13263.539