Show data table
| 1970 | 0.2267 Mt | 1989 | 0.4131 Mt | 2008 | 1.9003 Mt |
| 1971 | 0.2269 Mt | 1990 | 0.3273 Mt | 2009 | 1.8421 Mt |
| 1972 | 0.2261 Mt | 1991 | 0.4625 Mt | 2010 | 1.9623 Mt |
| 1973 | 0.2336 Mt | 1992 | 0.395 Mt | 2011 | 2.2171 Mt |
| 1974 | 0.2514 Mt | 1993 | 0.414 Mt | 2012 | 2.5815 Mt |
| 1975 | 0.2611 Mt | 1994 | 0.4512 Mt | 2013 | 3.0405 Mt |
| 1976 | 0.2705 Mt | 1995 | 0.4637 Mt | 2014 | 2.7537 Mt |
| 1977 | 0.2797 Mt | 1996 | 0.5131 Mt | 2015 | 3.9361 Mt |
| 1978 | 0.2844 Mt | 1997 | 0.8142 Mt | 2016 | 3.9314 Mt |
| 1979 | 0.3267 Mt | 1998 | 0.772 Mt | 2017 | 4.5408 Mt |
| 1980 | 0.3211 Mt | 1999 | 0.8081 Mt | 2018 | 5.412 Mt |
| 1981 | 0.3082 Mt | 2000 | 0.8726 Mt | 2019 | 5.6993 Mt |
| 1982 | 0.2875 Mt | 2001 | 1.0203 Mt | 2020 | 5.7011 Mt |
| 1983 | 0.3139 Mt | 2002 | 1.0828 Mt | 2021 | 6.4371 Mt |
| 1984 | 0.304 Mt | 2003 | 1.2062 Mt | 2022 | 6.4885 Mt |
| 1985 | 0.2941 Mt | 2004 | 1.0691 Mt | 2023 | 6.2637 Mt |
| 1986 | 0.358 Mt | 2005 | 1.1383 Mt | 2024 | 6.4757 Mt |
| 1987 | 0.5081 Mt | 2006 | 1.1497 Mt | | |
| 1988 | 0.4985 Mt | 2007 | 1.6344 Mt | | |
Show data table
| 1970 | 0.04 t | 1989 | 0.05 t | 2008 | 0.12 t |
| 1971 | 0.04 t | 1990 | 0.04 t | 2009 | 0.12 t |
| 1972 | 0.04 t | 1991 | 0.05 t | 2010 | 0.12 t |
| 1973 | 0.04 t | 1992 | 0.04 t | 2011 | 0.13 t |
| 1974 | 0.04 t | 1993 | 0.04 t | 2012 | 0.15 t |
| 1975 | 0.04 t | 1994 | 0.04 t | 2013 | 0.17 t |
| 1976 | 0.04 t | 1995 | 0.04 t | 2014 | 0.15 t |
| 1977 | 0.04 t | 1996 | 0.05 t | 2015 | 0.21 t |
| 1978 | 0.04 t | 1997 | 0.07 t | 2016 | 0.2 t |
| 1979 | 0.05 t | 1998 | 0.07 t | 2017 | 0.23 t |
| 1980 | 0.05 t | 1999 | 0.07 t | 2018 | 0.26 t |
| 1981 | 0.04 t | 2000 | 0.07 t | 2019 | 0.27 t |
| 1982 | 0.04 t | 2001 | 0.08 t | 2020 | 0.27 t |
| 1983 | 0.04 t | 2002 | 0.09 t | 2021 | 0.29 t |
| 1984 | 0.04 t | 2003 | 0.09 t | 2022 | 0.29 t |
| 1985 | 0.04 t | 2004 | 0.08 t | 2023 | 0.27 t |
| 1986 | 0.04 t | 2005 | 0.08 t | 2024 | 0.27 t |
| 1987 | 0.06 t | 2006 | 0.08 t | | |
| 1988 | 0.06 t | 2007 | 0.11 t | | |