Year	kt
1960	2086.523
1961	2291.875
1962	2955.602
1963	3931.024
1964	3252.629
1965	4550.747
1966	6530.927
1967	10502.288
1968	15397.733
1969	20065.824
1970	27575.84
1971	31627.875
1972	32566.627
1973	40230.657
1974	41715.792
1975	46072.188
1976	53560.202
1977	61539.594
1978	69478.649
1979	78987.18
1980	77619.389
1981	76827.317
1982	75624.541
1983	78833.166
1984	78484.801
1985	78748.825
1986	82529.502
1987	85782.131
1988	103270.054
1989	117369.669
1990	129093.068
1991	140292.086
1992	165865.744
1993	189319.876
1994	202521.076
1995	223177.287
1996	238663.028
1997	246811.102
1998	188432.462
1999	210313.451
2000	222799.586
2001	210786.494
2002	211325.543
2003	201490.649
2004	203551.503
2005	187479.042
2006	178458.222
2007	184710.457
2008	169921.446
2009	165488.043
2010	174919.567
2011	165187.349
2012	165077.339
2013	163808.557
2014	156272.872
2015	173012.727
2016	188307.784