Year kt 1960 113.677 1961 135.679 1962 91.675 1963 99.009 1964 106.343 1965 132.012 1966 212.686 1967 359.366 1968 319.029 1969 322.696 1970 363.033 1971 253.023 1972 352.032 1973 275.025 1974 429.039 1975 315.362 1976 289.693 1977 260.357 1978 297.027 1979 374.034 1980 234.688 1981 311.695 1982 187.017 1983 256.69 1984 264.024 1985 253.023 1986 223.687 1987 253.023 1988 308.028 1989 297.027 1990 264.024 1991 271.358 1992 278.692 1993 289.693 1994 264.024 1995 238.355 1996 238.355 1997 260.357 1998 209.019 1999 297.027 2000 278.692 2001 256.69 2002 216.353 2003 62.339 2004 0 2005 0 2006 0 2007 0 2008 0 2009 0 2010 55.005 2011 44.004 2012 0 2013 0 2014 0 2015 0 2016 0