Show data table
| 1970 | 0.0076 Mt | 1989 | 0.0218 Mt | 2008 | 0.0736 Mt |
| 1971 | 0.0076 Mt | 1990 | 0.0213 Mt | 2009 | 0.075 Mt |
| 1972 | 0.0092 Mt | 1991 | 0.0214 Mt | 2010 | 0.0773 Mt |
| 1973 | 0.0093 Mt | 1992 | 0.0216 Mt | 2011 | 0.0595 Mt |
| 1974 | 0.0083 Mt | 1993 | 0.0388 Mt | 2012 | 0.0543 Mt |
| 1975 | 0.01 Mt | 1994 | 0.0512 Mt | 2013 | 0.0599 Mt |
| 1976 | 0.0091 Mt | 1995 | 0.0589 Mt | 2014 | 0.0669 Mt |
| 1977 | 0.01 Mt | 1996 | 0.0646 Mt | 2015 | 0.0724 Mt |
| 1978 | 0.01 Mt | 1997 | 0.0622 Mt | 2016 | 0.0777 Mt |
| 1979 | 0.0099 Mt | 1998 | 0.0361 Mt | 2017 | 0.0692 Mt |
| 1980 | 0.0098 Mt | 1999 | 0.0619 Mt | 2018 | 0.0715 Mt |
| 1981 | 0.0142 Mt | 2000 | 0.0542 Mt | 2019 | 0.0862 Mt |
| 1982 | 0.0133 Mt | 2001 | 0.0545 Mt | 2020 | 0.0771 Mt |
| 1983 | 0.0131 Mt | 2002 | 0.0492 Mt | 2021 | 0.0764 Mt |
| 1984 | 0.0145 Mt | 2003 | 0.056 Mt | 2022 | 0.0812 Mt |
| 1985 | 0.0145 Mt | 2004 | 0.0598 Mt | 2023 | 0.0814 Mt |
| 1986 | 0.0125 Mt | 2005 | 0.0589 Mt | 2024 | 0.0843 Mt |
| 1987 | 0.0185 Mt | 2006 | 0.0625 Mt | | |
| 1988 | 0.0213 Mt | 2007 | 0.0756 Mt | | |
Show data table
| 1970 | 0.11 t | 1989 | 0.31 t | 2008 | 1.07 t |
| 1971 | 0.11 t | 1990 | 0.31 t | 2009 | 1.09 t |
| 1972 | 0.13 t | 1991 | 0.31 t | 2010 | 1.12 t |
| 1973 | 0.13 t | 1992 | 0.31 t | 2011 | 0.86 t |
| 1974 | 0.12 t | 1993 | 0.56 t | 2012 | 0.79 t |
| 1975 | 0.14 t | 1994 | 0.74 t | 2013 | 0.86 t |
| 1976 | 0.13 t | 1995 | 0.85 t | 2014 | 0.95 t |
| 1977 | 0.14 t | 1996 | 0.93 t | 2015 | 1.03 t |
| 1978 | 0.14 t | 1997 | 0.9 t | 2016 | 1.12 t |
| 1979 | 0.14 t | 1998 | 0.52 t | 2017 | 1.01 t |
| 1980 | 0.13 t | 1999 | 0.9 t | 2018 | 1.05 t |
| 1981 | 0.19 t | 2000 | 0.79 t | 2019 | 1.27 t |
| 1982 | 0.18 t | 2001 | 0.8 t | 2020 | 1.14 t |
| 1983 | 0.18 t | 2002 | 0.72 t | 2021 | 1.14 t |
| 1984 | 0.2 t | 2003 | 0.82 t | 2022 | 1.22 t |
| 1985 | 0.2 t | 2004 | 0.87 t | 2023 | 1.22 t |
| 1986 | 0.18 t | 2005 | 0.86 t | 2024 | 1.27 t |
| 1987 | 0.26 t | 2006 | 0.91 t | | |
| 1988 | 0.3 t | 2007 | 1.1 t | | |