Show data table
| 1970 | 0.15 Mt | 1989 | 0.0695 Mt | 2008 | 0.7254 Mt |
| 1971 | 0.15 Mt | 1990 | 0.0538 Mt | 2009 | 0.7081 Mt |
| 1972 | 0.1492 Mt | 1991 | 0.0677 Mt | 2010 | 0.7498 Mt |
| 1973 | 0.1544 Mt | 1992 | 0.0671 Mt | 2011 | 0.8717 Mt |
| 1974 | 0.1667 Mt | 1993 | 0.0654 Mt | 2012 | 0.748 Mt |
| 1975 | 0.1732 Mt | 1994 | 0.0767 Mt | 2013 | 0.7315 Mt |
| 1976 | 0.1795 Mt | 1995 | 0.0767 Mt | 2014 | 0.7741 Mt |
| 1977 | 0.1859 Mt | 1996 | 0.0916 Mt | 2015 | 0.7908 Mt |
| 1978 | 0.1889 Mt | 1997 | 0.091 Mt | 2016 | 0.8304 Mt |
| 1979 | 0.2181 Mt | 1998 | 0.0932 Mt | 2017 | 0.8881 Mt |
| 1980 | 0.2141 Mt | 1999 | 0.0972 Mt | 2018 | 0.7961 Mt |
| 1981 | 0.2048 Mt | 2000 | 0.2802 Mt | 2019 | 0.8379 Mt |
| 1982 | 0.0818 Mt | 2001 | 0.3248 Mt | 2020 | 0.6283 Mt |
| 1983 | 0.0896 Mt | 2002 | 0.3613 Mt | 2021 | 0.6479 Mt |
| 1984 | 0.1056 Mt | 2003 | 0.3632 Mt | 2022 | 0.6801 Mt |
| 1985 | 0.1052 Mt | 2004 | 0.3895 Mt | 2023 | 0.6508 Mt |
| 1986 | 0.034 Mt | 2005 | 0.6073 Mt | 2024 | 0.6762 Mt |
| 1987 | 0.0505 Mt | 2006 | 0.6606 Mt | | |
| 1988 | 0.0625 Mt | 2007 | 0.749 Mt | | |
Show data table
| 1970 | 0.52 t | 1989 | 0.19 t | 2008 | 1.45 t |
| 1971 | 0.51 t | 1990 | 0.14 t | 2009 | 1.4 t |
| 1972 | 0.5 t | 1991 | 0.18 t | 2010 | 1.47 t |
| 1973 | 0.51 t | 1992 | 0.17 t | 2011 | 1.7 t |
| 1974 | 0.55 t | 1993 | 0.16 t | 2012 | 1.46 t |
| 1975 | 0.57 t | 1994 | 0.19 t | 2013 | 1.43 t |
| 1976 | 0.58 t | 1995 | 0.18 t | 2014 | 1.51 t |
| 1977 | 0.59 t | 1996 | 0.22 t | 2015 | 1.54 t |
| 1978 | 0.6 t | 1997 | 0.21 t | 2016 | 1.62 t |
| 1979 | 0.68 t | 1998 | 0.21 t | 2017 | 1.73 t |
| 1980 | 0.66 t | 1999 | 0.22 t | 2018 | 1.55 t |
| 1981 | 0.62 t | 2000 | 0.62 t | 2019 | 1.63 t |
| 1982 | 0.25 t | 2001 | 0.71 t | 2020 | 1.22 t |
| 1983 | 0.27 t | 2002 | 0.77 t | 2021 | 1.25 t |
| 1984 | 0.31 t | 2003 | 0.77 t | 2022 | 1.31 t |
| 1985 | 0.3 t | 2004 | 0.81 t | 2023 | 1.25 t |
| 1986 | 0.1 t | 2005 | 1.25 t | 2024 | 1.29 t |
| 1987 | 0.14 t | 2006 | 1.35 t | | |
| 1988 | 0.17 t | 2007 | 1.51 t | | |