Year Million tonnes || 1961 6.500 || 1962 6.520 || 1963 5.820 || 1964 5.150 || 1965 5.400 || 1966 5.420 || 1967 5.500 || 1968 5.700 || 1969 5.900 || 1970 4.410 || 1971 4.870 || 1972 4.270 || 1973 4.770 || 1974 4.820 || 1975 4.980 || 1976 4.980 || 1977 5.140 || 1978 5.500 || 1979 5.375 || 1980 5.130 || 1981 5.985 || 1982 5.985 || 1983 6.800 || 1984 7.600 || 1985 11.900 || 1986 12.400 || 1987 13.800 || 1988 14.200 || 1989 12.400 || 1990 10.700 || 1991 11.200 || 1992 14.200 || 1993 17.000 || 1994 17.100 || 1995 18.520 || 1996 23.477 || 1997 34.702 || 1998 35.485 || 1999 46.165 || 2000 51.466 || 2001 57.178 || 2002 61.608 || 2003 58.002 || 2004 57.515 || 2005 59.893 || 2006 61.845 || 2007 54.754 || 2008 57.506 || 2009 57.710 || 2010 60.510 || 2011 60.004 || 2012 60.291 || 2013 61.011 || 2014 61.491 || 2015 62.671 || 2016 62.207 || 2017 63.147 || 2018 61.537 || 2019 60.861 || 2020 60.083

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