Year	kt
1960	1386.126
1961	2086.523
1962	2482.559
1963	3285.632
1964	3582.659
1965	2416.553
1966	462.042
1967	2816.256
1968	5119.132
1969	6886.626
1970	17836.288
1971	16270.479
1972	21726.975
1973	20692.881
1974	21426.281
1975	23879.504
1976	29350.668
1977	27619.844
1978	32474.952
1979	35441.555
1980	30447.101
1981	25709.337
1982	28400.915
1983	33413.704
1984	31976.24
1985	32379.61
1986	34103.1
1987	31796.557
1988	35261.872
1989	40993.393
1990	43490.62
1991	44227.687
1992	46497.56
1993	46900.93
1994	56794.496
1995	37154.044
1996	45030.76
1997	53805.891
1998	44191.017
1999	46585.568
2000	45723.823
2001	45151.771
2002	40491.014
2003	20755.22
2004	16325.484
2005	17590.599
2006	17025.881
2007	5163.136
2008	21033.912
2009	43380.61
2010	41770.797
2011	30047.398
2012	31792.89
2013	34623.814
2014	33905.082
2015	38287.147
2016	15852.441