Year	kt
1960	1877.504
1961	2456.89
1962	2339.546
1963	2456.89
1964	3234.294
1965	4257.387
1966	5177.804
1967	6633.603
1968	3527.654
1969	3751.341
1970	5496.833
1971	6409.916
1972	7040.64
1973	8588.114
1974	9666.212
1975	9629.542
1976	11301.694
1977	8837.47
1978	9145.498
1979	13725.581
1980	21096.251
1981	24975.937
1982	29130.648
1983	29471.679
1984	37762.766
1985	35529.563
1986	38155.135
1987	26934.115
1988	33223.02
1989	32603.297
1990	29801.709
1991	31209.837
1992	35133.527
1993	33036.003
1994	23549.474
1995	22255.023
1996	25551.656
1997	29317.665
1998	25610.328
1999	26945.116
2000	31565.536
2001	37234.718
2002	37605.085
2003	34231.445
2004	30872.473
2005	39827.287
2006	32005.576
2007	27282.48
2008	33527.381
2009	27275.146
2010	59405.4
2011	70120.374
2012	56625.814
2013	62265.66
2014	66658.726
2015	54205.594
2016	61664.272