Year	kt
1960	7209.322
1961	8027.063
1962	9611.207
1963	11719.732
1964	14048.277
1965	17212.898
1966	21939.661
1967	21261.266
1968	24704.579
1969	27586.841
1970	30817.468
1971	31880.898
1972	34352.456
1973	38547.504
1974	34964.845
1975	34645.816
1976	36607.661
1977	35874.261
1978	33795.072
1979	35104.191
1980	35547.898
1981	31671.879
1982	28793.284
1983	26505.076
1984	24920.932
1985	27949.874
1986	33347.698
1987	33600.721
1988	28474.255
1989	28507.258
1990	25665.333
1991	26519.744
1992	22530.048
1993	23193.775
1994	24466.224
1995	22324.696
1996	25779.01
1997	26527.078
1998	27509.834
1999	26472.073
2000	23868.503
2001	23677.819
2002	26347.395
2003	27128.466
2004	28356.911
2005	26589.417
2006	27590.508
2007	26365.73
2008	26116.374
2009	24660.575
2010	25441.646
2011	25078.613
2012	23476.134
2013	19882.474
2014	23633.815
2015	20938.57
2016	22856.411