Year	kt
1960	18063.642
1961	17674.94
1962	18100.312
1963	19614.783
1964	18951.056
1965	17979.301
1966	16857.199
1967	15764.433
1968	15397.733
1969	15339.061
1970	17814.286
1971	15060.369
1972	15647.089
1973	15867.109
1974	16618.844
1975	14576.325
1976	14279.298
1977	12552.141
1978	12845.501
1979	14447.98
1980	14202.291
1981	14653.332
1982	14139.952
1983	14407.643
1984	16868.2
1985	16670.182
1986	14737.673
1987	14811.013
1988	14297.633
1989	13857.593
1990	15713.095
1991	16439.161
1992	12750.159
1993	11441.04
1994	11613.389
1995	13215.868
1996	13274.54
1997	14106.949
1998	12361.457
1999	12302.785
2000	13901.597
2001	14334.303
2002	14561.657
2003	15639.755
2004	15247.386
2005	15295.057
2006	15460.072
2007	14690.002
2008	14330.636
2009	10975.331
2010	13039.852
2011	13252.538
2012	12310.119
2013	12530.139
2014	11415.371
2015	12266.115
2016	11393.369