Show data table
| 1970 | 3.1582 Mt | 1989 | 1.5313 Mt | 2008 | 3.1494 Mt |
| 1971 | 3.1705 Mt | 1990 | 1.1619 Mt | 2009 | 3.403 Mt |
| 1972 | 2.9157 Mt | 1991 | 0.9743 Mt | 2010 | 3.6056 Mt |
| 1973 | 3.1029 Mt | 1992 | 1.1614 Mt | 2011 | 4.2489 Mt |
| 1974 | 2.9303 Mt | 1993 | 1.3511 Mt | 2012 | 4.7019 Mt |
| 1975 | 2.5307 Mt | 1994 | 1.1452 Mt | 2013 | 5.1174 Mt |
| 1976 | 2.5683 Mt | 1995 | 1.2575 Mt | 2014 | 5.7908 Mt |
| 1977 | 2.4964 Mt | 1996 | 1.2134 Mt | 2015 | 6.4582 Mt |
| 1978 | 2.1793 Mt | 1997 | 1.3414 Mt | 2016 | 8.3319 Mt |
| 1979 | 2.0589 Mt | 1998 | 1.2964 Mt | 2017 | 8.3122 Mt |
| 1980 | 2.4898 Mt | 1999 | 1.29 Mt | 2018 | 8.0554 Mt |
| 1981 | 2.1928 Mt | 2000 | 1.571 Mt | 2019 | 8.6293 Mt |
| 1982 | 2.022 Mt | 2001 | 1.8966 Mt | 2020 | 7.9534 Mt |
| 1983 | 1.8438 Mt | 2002 | 1.9873 Mt | 2021 | 9.1439 Mt |
| 1984 | 1.5537 Mt | 2003 | 2.5256 Mt | 2022 | 10.9 Mt |
| 1985 | 1.5763 Mt | 2004 | 2.7803 Mt | 2023 | 10.72 Mt |
| 1986 | 1.5411 Mt | 2005 | 2.6658 Mt | 2024 | 10.11 Mt |
| 1987 | 1.5403 Mt | 2006 | 2.8271 Mt | | |
| 1988 | 1.5484 Mt | 2007 | 3.244 Mt | | |
Show data table
| 1970 | 0.38 t | 1989 | 0.12 t | 2008 | 0.14 t |
| 1971 | 0.37 t | 1990 | 0.09 t | 2009 | 0.15 t |
| 1972 | 0.34 t | 1991 | 0.07 t | 2010 | 0.16 t |
| 1973 | 0.35 t | 1992 | 0.09 t | 2011 | 0.18 t |
| 1974 | 0.32 t | 1993 | 0.1 t | 2012 | 0.19 t |
| 1975 | 0.27 t | 1994 | 0.08 t | 2013 | 0.2 t |
| 1976 | 0.26 t | 1995 | 0.08 t | 2014 | 0.22 t |
| 1977 | 0.24 t | 1996 | 0.07 t | 2015 | 0.24 t |
| 1978 | 0.21 t | 1997 | 0.08 t | 2016 | 0.3 t |
| 1979 | 0.19 t | 1998 | 0.07 t | 2017 | 0.3 t |
| 1980 | 0.22 t | 1999 | 0.07 t | 2018 | 0.28 t |
| 1981 | 0.19 t | 2000 | 0.09 t | 2019 | 0.29 t |
| 1982 | 0.17 t | 2001 | 0.1 t | 2020 | 0.26 t |
| 1983 | 0.15 t | 2002 | 0.1 t | 2021 | 0.29 t |
| 1984 | 0.13 t | 2003 | 0.13 t | 2022 | 0.33 t |
| 1985 | 0.13 t | 2004 | 0.14 t | 2023 | 0.32 t |
| 1986 | 0.12 t | 2005 | 0.13 t | 2024 | 0.29 t |
| 1987 | 0.12 t | 2006 | 0.14 t | | |
| 1988 | 0.12 t | 2007 | 0.15 t | | |