Show data table
| 1970 | 15.45 Mt | 1989 | 20.63 Mt | 2008 | 7.8239 Mt |
| 1971 | 15.47 Mt | 1990 | 23.66 Mt | 2009 | 7.0415 Mt |
| 1972 | 16.43 Mt | 1991 | 21.26 Mt | 2010 | 6.6057 Mt |
| 1973 | 17.3 Mt | 1992 | 14 Mt | 2011 | 7.9039 Mt |
| 1974 | 18.07 Mt | 1993 | 10.29 Mt | 2012 | 10.44 Mt |
| 1975 | 19.14 Mt | 1994 | 6.7303 Mt | 2013 | 9.6866 Mt |
| 1976 | 19.82 Mt | 1995 | 4.758 Mt | 2014 | 9.9416 Mt |
| 1977 | 20.35 Mt | 1996 | 5.9157 Mt | 2015 | 10.32 Mt |
| 1978 | 21.31 Mt | 1997 | 5.8369 Mt | 2016 | 9.7414 Mt |
| 1979 | 21.84 Mt | 1998 | 6.157 Mt | 2017 | 9.6372 Mt |
| 1980 | 22.96 Mt | 1999 | 4.9139 Mt | 2018 | 11.47 Mt |
| 1981 | 22.03 Mt | 2000 | 4.7979 Mt | 2019 | 10.23 Mt |
| 1982 | 20.88 Mt | 2001 | 4.031 Mt | 2020 | 9.3085 Mt |
| 1983 | 19.78 Mt | 2002 | 5.0384 Mt | 2021 | 10.52 Mt |
| 1984 | 18.82 Mt | 2003 | 5.6599 Mt | 2022 | 10.5 Mt |
| 1985 | 18.27 Mt | 2004 | 5.6107 Mt | 2023 | 10.23 Mt |
| 1986 | 18.18 Mt | 2005 | 5.6133 Mt | 2024 | 10.74 Mt |
| 1987 | 19.87 Mt | 2006 | 5.5903 Mt | | |
| 1988 | 20.57 Mt | 2007 | 6.7415 Mt | | |
Show data table
| 1970 | 5.22 t | 1989 | 4.79 t | 2008 | 1.47 t |
| 1971 | 5.12 t | 1990 | 5.39 t | 2009 | 1.31 t |
| 1972 | 5.32 t | 1991 | 4.76 t | 2010 | 1.21 t |
| 1973 | 5.49 t | 1992 | 3.1 t | 2011 | 1.43 t |
| 1974 | 5.61 t | 1993 | 2.28 t | 2012 | 1.85 t |
| 1975 | 5.81 t | 1994 | 1.49 t | 2013 | 1.68 t |
| 1976 | 5.9 t | 1995 | 1.04 t | 2014 | 1.68 t |
| 1977 | 5.94 t | 1996 | 1.28 t | 2015 | 1.71 t |
| 1978 | 6.11 t | 1997 | 1.24 t | 2016 | 1.58 t |
| 1979 | 6.15 t | 1998 | 1.29 t | 2017 | 1.53 t |
| 1980 | 6.35 t | 1999 | 1.02 t | 2018 | 1.78 t |
| 1981 | 5.98 t | 2000 | 0.98 t | 2019 | 1.55 t |
| 1982 | 5.56 t | 2001 | 0.82 t | 2020 | 1.38 t |
| 1983 | 5.15 t | 2002 | 1.01 t | 2021 | 1.53 t |
| 1984 | 4.81 t | 2003 | 1.12 t | 2022 | 1.51 t |
| 1985 | 4.58 t | 2004 | 1.1 t | 2023 | 1.44 t |
| 1986 | 4.47 t | 2005 | 1.09 t | 2024 | 1.49 t |
| 1987 | 4.79 t | 2006 | 1.07 t | | |
| 1988 | 4.88 t | 2007 | 1.28 t | | |