Year	kt
1960	1664.818
1961	1536.473
1962	1459.466
1963	1668.485
1964	2002.182
1965	2115.859
1966	2233.203
1967	2398.218
1968	2867.594
1969	2970.27
1970	3472.649
1971	3670.667
1972	3997.03
1973	4283.056
1974	5082.462
1975	6398.915
1976	7102.979
1977	6373.246
1978	9196.836
1979	10637.967
1980	11870.079
1981	15177.713
1982	17605.267
1983	17931.63
1984	19383.762
1985	17216.565
1986	12797.83
1987	13303.876
1988	14623.996
1989	17106.555
1990	13523.896
1991	13355.214
1992	19350.759
1993	21136.588
1994	10656.302
1995	19585.447
1996	20879.898
1997	15265.721
1998	19295.754
1999	18492.681
2000	17341.243
2001	19666.121
2002	21250.265
2003	22893.081
2004	24678.91
2005	26024.699
2006	24565.233
2007	27348.486
2008	28866.624
2009	30817.468
2010	31231.839
2011	30073.067
2012	25830.348
2013	34389.126
2014	38177.137
2015	36365.639
2016	34257.114