Show data table
| 1970 | 0.6831 Mt | 1989 | 2.3284 Mt | 2008 | 2.7327 Mt |
| 1971 | 0.6831 Mt | 1990 | 2.3219 Mt | 2009 | 2.5185 Mt |
| 1972 | 0.8563 Mt | 1991 | 2.2182 Mt | 2010 | 2.5947 Mt |
| 1973 | 0.8224 Mt | 1992 | 2.176 Mt | 2011 | 2.5818 Mt |
| 1974 | 0.7531 Mt | 1993 | 2.8133 Mt | 2012 | 2.7244 Mt |
| 1975 | 0.678 Mt | 1994 | 2.5155 Mt | 2013 | 2.3827 Mt |
| 1976 | 0.7649 Mt | 1995 | 2.3859 Mt | 2014 | 2.3694 Mt |
| 1977 | 0.8091 Mt | 1996 | 2.3312 Mt | 2015 | 1.6722 Mt |
| 1978 | 0.9426 Mt | 1997 | 2.4771 Mt | 2016 | 1.3655 Mt |
| 1979 | 0.9189 Mt | 1998 | 2.384 Mt | 2017 | 1.5582 Mt |
| 1980 | 1.0211 Mt | 1999 | 2.4177 Mt | 2018 | 1.5674 Mt |
| 1981 | 1.1558 Mt | 2000 | 2.135 Mt | 2019 | 1.673 Mt |
| 1982 | 1.3232 Mt | 2001 | 2.4949 Mt | 2020 | 1.6204 Mt |
| 1983 | 0.981 Mt | 2002 | 2.3242 Mt | 2021 | 1.6274 Mt |
| 1984 | 1.3383 Mt | 2003 | 2.6135 Mt | 2022 | 1.7963 Mt |
| 1985 | 1.1693 Mt | 2004 | 2.6069 Mt | 2023 | 1.7877 Mt |
| 1986 | 1.8837 Mt | 2005 | 2.6349 Mt | 2024 | 1.8083 Mt |
| 1987 | 1.9747 Mt | 2006 | 2.6594 Mt | | |
| 1988 | 2.1477 Mt | 2007 | 2.7234 Mt | | |
Show data table
| 1970 | 2.26 t | 1989 | 6.64 t | 2008 | 6.68 t |
| 1971 | 2.26 t | 1990 | 6.56 t | 2009 | 6.11 t |
| 1972 | 2.83 t | 1991 | 6.1 t | 2010 | 6.26 t |
| 1973 | 2.72 t | 1992 | 5.92 t | 2011 | 6.2 t |
| 1974 | 2.49 t | 1993 | 7.58 t | 2012 | 6.49 t |
| 1975 | 2.23 t | 1994 | 6.71 t | 2013 | 5.61 t |
| 1976 | 2.5 t | 1995 | 6.32 t | 2014 | 5.47 t |
| 1977 | 2.64 t | 1996 | 6.14 t | 2015 | 3.76 t |
| 1978 | 3.04 t | 1997 | 6.47 t | 2016 | 3 t |
| 1979 | 2.93 t | 1998 | 6.19 t | 2017 | 3.34 t |
| 1980 | 3.22 t | 1999 | 6.24 t | 2018 | 3.24 t |
| 1981 | 3.62 t | 2000 | 5.47 t | 2019 | 3.32 t |
| 1982 | 4.06 t | 2001 | 6.35 t | 2020 | 3.14 t |
| 1983 | 2.97 t | 2002 | 5.87 t | 2021 | 3.14 t |
| 1984 | 4.05 t | 2003 | 6.56 t | 2022 | 3.38 t |
| 1985 | 3.48 t | 2004 | 6.5 t | 2023 | 3.23 t |
| 1986 | 5.51 t | 2005 | 6.52 t | 2024 | 3.18 t |
| 1987 | 5.73 t | 2006 | 6.56 t | | |
| 1988 | 6.18 t | 2007 | 6.7 t | | |