Year	kt
1960	1807.831
1961	1884.838
1962	2544.898
1963	2918.932
1964	3219.626
1965	3446.98
1966	4767.1
1967	5203.473
1968	6413.583
1969	7161.651
1970	3920.023
1971	4052.035
1972	4789.102
1973	5361.154
1974	5713.186
1975	6087.22
1976	6424.584
1977	7029.639
1978	7928.054
1979	6596.933
1980	13956.602
1981	11529.048
1982	8808.134
1983	9673.546
1984	10469.285
1985	10403.279
1986	13465.224
1987	14458.981
1988	14304.967
1989	17366.912
1990	13982.271
1991	1437.464
1992	7455.011
1993	15196.048
1994	14594.66
1995	17825.287
1996	17869.291
1997	17806.952
1998	17993.969
1999	16468.497
2000	20703.882
2001	20256.508
2002	18166.318
2003	21169.591
2004	22783.071
2005	25547.989
2006	26255.72
2007	25558.99
2008	26640.755
2009	24121.526
2010	28155.226
2011	32885.656
2012	34759.493
2013	34594.478
2014	34308.452
2015	39097.554
2016	41627.784