Show data table
| 1970 | 0.7685 Mt | 1989 | 0.7754 Mt | 2008 | 1.87 Mt |
| 1971 | 0.7696 Mt | 1990 | 0.9079 Mt | 2009 | 1.7759 Mt |
| 1972 | 0.7884 Mt | 1991 | 0.9706 Mt | 2010 | 1.9684 Mt |
| 1973 | 0.7295 Mt | 1992 | 0.9831 Mt | 2011 | 2.2944 Mt |
| 1974 | 0.7202 Mt | 1993 | 1.0192 Mt | 2012 | 2.8507 Mt |
| 1975 | 0.8004 Mt | 1994 | 1.2553 Mt | 2013 | 3.0496 Mt |
| 1976 | 0.745 Mt | 1995 | 1.4147 Mt | 2014 | 3.1337 Mt |
| 1977 | 0.7678 Mt | 1996 | 1.359 Mt | 2015 | 3.4183 Mt |
| 1978 | 0.8373 Mt | 1997 | 1.4911 Mt | 2016 | 3.2513 Mt |
| 1979 | 0.9033 Mt | 1998 | 1.6645 Mt | 2017 | 3.5528 Mt |
| 1980 | 0.9974 Mt | 1999 | 1.7076 Mt | 2018 | 3.2753 Mt |
| 1981 | 0.801 Mt | 2000 | 1.6942 Mt | 2019 | 4.0111 Mt |
| 1982 | 0.7405 Mt | 2001 | 1.7104 Mt | 2020 | 3.1281 Mt |
| 1983 | 0.6703 Mt | 2002 | 1.1663 Mt | 2021 | 4.103 Mt |
| 1984 | 0.8634 Mt | 2003 | 1.5496 Mt | 2022 | 4.384 Mt |
| 1985 | 0.7886 Mt | 2004 | 1.6759 Mt | 2023 | 4.5942 Mt |
| 1986 | 0.7453 Mt | 2005 | 1.7881 Mt | 2024 | 4.6827 Mt |
| 1987 | 0.8087 Mt | 2006 | 1.7144 Mt | | |
| 1988 | 0.7469 Mt | 2007 | 1.8034 Mt | | |
Show data table
| 1970 | 0.12 t | 1989 | 0.07 t | 2008 | 0.09 t |
| 1971 | 0.11 t | 1990 | 0.08 t | 2009 | 0.08 t |
| 1972 | 0.11 t | 1991 | 0.08 t | 2010 | 0.09 t |
| 1973 | 0.1 t | 1992 | 0.08 t | 2011 | 0.1 t |
| 1974 | 0.1 t | 1993 | 0.08 t | 2012 | 0.12 t |
| 1975 | 0.1 t | 1994 | 0.09 t | 2013 | 0.13 t |
| 1976 | 0.09 t | 1995 | 0.1 t | 2014 | 0.13 t |
| 1977 | 0.09 t | 1996 | 0.09 t | 2015 | 0.13 t |
| 1978 | 0.1 t | 1997 | 0.1 t | 2016 | 0.12 t |
| 1979 | 0.1 t | 1998 | 0.11 t | 2017 | 0.13 t |
| 1980 | 0.11 t | 1999 | 0.11 t | 2018 | 0.12 t |
| 1981 | 0.09 t | 2000 | 0.1 t | 2019 | 0.14 t |
| 1982 | 0.08 t | 2001 | 0.1 t | 2020 | 0.11 t |
| 1983 | 0.07 t | 2002 | 0.07 t | 2021 | 0.14 t |
| 1984 | 0.09 t | 2003 | 0.09 t | 2022 | 0.14 t |
| 1985 | 0.08 t | 2004 | 0.09 t | 2023 | 0.15 t |
| 1986 | 0.07 t | 2005 | 0.09 t | 2024 | 0.15 t |
| 1987 | 0.07 t | 2006 | 0.09 t | | |
| 1988 | 0.07 t | 2007 | 0.09 t | | |