Year	kt
1960	1133.103
1961	1375.125
1962	1697.821
1963	2126.86
1964	2673.243
1965	3164.621
1966	3575.325
1967	4169.379
1968	4679.092
1969	5764.524
1970	4715.762
1971	4946.783
1972	715.065
1973	1144.104
1974	1382.459
1975	964.421
1976	1411.795
1977	1580.477
1978	1675.819
1979	1917.841
1980	2218.535
1981	2442.222
1982	3168.288
1983	3523.987
1984	4470.073
1985	5089.796
1986	5738.855
1987	5933.206
1988	7003.97
1989	7422.008
1990	7583.356
1991	9064.824
1992	9614.874
1993	10399.612
1994	11481.377
1995	13039.852
1996	13509.228
1997	13274.54
1998	14334.303
1999	15628.754
2000	16893.869
2001	18918.053
2002	19904.476
2003	21407.946
2004	23109.434
2005	24744.916
2006	28279.904
2007	29603.691
2008	32251.265
2009	35470.891
2010	39431.251
2011	39658.605
2012	41748.795
2013	43369.609
2014	45969.512
2015	48782.101
2016	53593.205