Show data table
| 1970 | 0.937 Mt | 1989 | 0.7049 Mt | 2008 | 3.4804 Mt |
| 1971 | 0.9437 Mt | 1990 | 0.8308 Mt | 2009 | 3.8307 Mt |
| 1972 | 0.9278 Mt | 1991 | 0.8449 Mt | 2010 | 3.7998 Mt |
| 1973 | 0.8552 Mt | 1992 | 0.86 Mt | 2011 | 4.2628 Mt |
| 1974 | 0.8938 Mt | 1993 | 0.8666 Mt | 2012 | 4.329 Mt |
| 1975 | 0.8224 Mt | 1994 | 0.7817 Mt | 2013 | 4.4114 Mt |
| 1976 | 1.0228 Mt | 1995 | 1.0126 Mt | 2014 | 4.8524 Mt |
| 1977 | 0.9524 Mt | 1996 | 1.1054 Mt | 2015 | 5.5954 Mt |
| 1978 | 0.7431 Mt | 1997 | 1.1617 Mt | 2016 | 6.0018 Mt |
| 1979 | 0.7659 Mt | 1998 | 1.3574 Mt | 2017 | 6.2539 Mt |
| 1980 | 0.7178 Mt | 1999 | 1.3975 Mt | 2018 | 6.8571 Mt |
| 1981 | 0.5841 Mt | 2000 | 1.4139 Mt | 2019 | 7.0646 Mt |
| 1982 | 0.5479 Mt | 2001 | 1.4377 Mt | 2020 | 7.1198 Mt |
| 1983 | 0.524 Mt | 2002 | 1.6383 Mt | 2021 | 8.1105 Mt |
| 1984 | 0.5444 Mt | 2003 | 1.731 Mt | 2022 | 7.9541 Mt |
| 1985 | 0.5654 Mt | 2004 | 1.8123 Mt | 2023 | 8.1166 Mt |
| 1986 | 0.6221 Mt | 2005 | 2.2217 Mt | 2024 | 8.2549 Mt |
| 1987 | 0.695 Mt | 2006 | 2.5786 Mt | | |
| 1988 | 0.7496 Mt | 2007 | 3.1093 Mt | | |
Show data table
| 1970 | 0.09 t | 1989 | 0.04 t | 2008 | 0.11 t |
| 1971 | 0.09 t | 1990 | 0.05 t | 2009 | 0.12 t |
| 1972 | 0.09 t | 1991 | 0.05 t | 2010 | 0.12 t |
| 1973 | 0.08 t | 1992 | 0.05 t | 2011 | 0.13 t |
| 1974 | 0.08 t | 1993 | 0.04 t | 2012 | 0.13 t |
| 1975 | 0.07 t | 1994 | 0.04 t | 2013 | 0.12 t |
| 1976 | 0.08 t | 1995 | 0.05 t | 2014 | 0.13 t |
| 1977 | 0.08 t | 1996 | 0.05 t | 2015 | 0.15 t |
| 1978 | 0.06 t | 1997 | 0.05 t | 2016 | 0.15 t |
| 1979 | 0.06 t | 1998 | 0.06 t | 2017 | 0.16 t |
| 1980 | 0.05 t | 1999 | 0.06 t | 2018 | 0.16 t |
| 1981 | 0.04 t | 2000 | 0.06 t | 2019 | 0.16 t |
| 1982 | 0.04 t | 2001 | 0.06 t | 2020 | 0.16 t |
| 1983 | 0.04 t | 2002 | 0.06 t | 2021 | 0.18 t |
| 1984 | 0.04 t | 2003 | 0.07 t | 2022 | 0.17 t |
| 1985 | 0.04 t | 2004 | 0.07 t | 2023 | 0.17 t |
| 1986 | 0.04 t | 2005 | 0.08 t | 2024 | 0.17 t |
| 1987 | 0.04 t | 2006 | 0.09 t | | |
| 1988 | 0.05 t | 2007 | 0.1 t | | |