Year	kt
1960	364554.805
1961	395067.912
1962	441924.838
1963	484088.004
1964	519272.869
1965	554124.037
1966	592726.546
1967	646279.414
1968	689073.304
1969	738185.435
1970	804345.449
1971	857212.588
1972	931021.964
1973	1000698.631
1974	1072568.164
1975	1134199.433
1976	1162270.318
1977	1204092.453
1978	1291814.427
1979	1298602.044
1980	1329591.861
1981	1345851.339
1982	1352653.624
1983	1353427.361
1984	1324021.688
1985	1336841.52
1986	1338238.647
1987	1179321.868
1988	1170165.369
1989	1154085.574
1990	1113832.915
1991	1116920.529
1992	583243.684
1993	535444.339
1994	402222.229
1995	379072.458
1996	354888.593
1997	335570.837
1998	330385.699
1999	323792.433
2000	333491.648
2001	334507.407
2002	323799.767
2003	329351.605
2004	326913.05
2005	331654.481
2006	346348.15
2007	339417.52
2008	370091.975
2009	358889.29
2010	343550.229
2011	397180.104
2012	401334.815
2013	370722.699
2014	393821.132
2015	361679.877
2016	391342.24