Show data table
| 1970 | 0.0144 Mt | 1989 | 0.0263 Mt | 2008 | 0.1047 Mt |
| 1971 | 0.0144 Mt | 1990 | 0.0386 Mt | 2009 | 0.1146 Mt |
| 1972 | 0.0143 Mt | 1991 | 0.0514 Mt | 2010 | 0.1236 Mt |
| 1973 | 0.0148 Mt | 1992 | 0.0435 Mt | 2011 | 0.1273 Mt |
| 1974 | 0.016 Mt | 1993 | 0.0424 Mt | 2012 | 0.1328 Mt |
| 1975 | 0.0166 Mt | 1994 | 0.0517 Mt | 2013 | 0.1334 Mt |
| 1976 | 0.0172 Mt | 1995 | 0.0532 Mt | 2014 | 0.1316 Mt |
| 1977 | 0.0178 Mt | 1996 | 0.0551 Mt | 2015 | 0.1407 Mt |
| 1978 | 0.0181 Mt | 1997 | 0.0547 Mt | 2016 | 0.1464 Mt |
| 1979 | 0.0209 Mt | 1998 | 0.056 Mt | 2017 | 0.1491 Mt |
| 1980 | 0.0205 Mt | 1999 | 0.0584 Mt | 2018 | 0.1525 Mt |
| 1981 | 0.0197 Mt | 2000 | 0.0547 Mt | 2019 | 0.1591 Mt |
| 1982 | 0.0183 Mt | 2001 | 0.0558 Mt | 2020 | 0.1541 Mt |
| 1983 | 0.02 Mt | 2002 | 0.0644 Mt | 2021 | 0.1583 Mt |
| 1984 | 0.0193 Mt | 2003 | 0.073 Mt | 2022 | 0.1412 Mt |
| 1985 | 0.0192 Mt | 2004 | 0.0826 Mt | 2023 | 0.1456 Mt |
| 1986 | 0.0221 Mt | 2005 | 0.0893 Mt | 2024 | 0.1477 Mt |
| 1987 | 0.0311 Mt | 2006 | 0.0952 Mt | | |
| 1988 | 0.0286 Mt | 2007 | 0.0978 Mt | | |
Show data table
| 1970 | 0.19 t | 1989 | 0.22 t | 2008 | 0.6 t |
| 1971 | 0.18 t | 1990 | 0.31 t | 2009 | 0.64 t |
| 1972 | 0.18 t | 1991 | 0.41 t | 2010 | 0.68 t |
| 1973 | 0.18 t | 1992 | 0.34 t | 2011 | 0.69 t |
| 1974 | 0.19 t | 1993 | 0.32 t | 2012 | 0.7 t |
| 1975 | 0.19 t | 1994 | 0.39 t | 2013 | 0.69 t |
| 1976 | 0.19 t | 1995 | 0.39 t | 2014 | 0.67 t |
| 1977 | 0.19 t | 1996 | 0.4 t | 2015 | 0.7 t |
| 1978 | 0.19 t | 1997 | 0.39 t | 2016 | 0.72 t |
| 1979 | 0.22 t | 1998 | 0.4 t | 2017 | 0.72 t |
| 1980 | 0.21 t | 1999 | 0.41 t | 2018 | 0.73 t |
| 1981 | 0.2 t | 2000 | 0.38 t | 2019 | 0.75 t |
| 1982 | 0.18 t | 2001 | 0.38 t | 2020 | 0.71 t |
| 1983 | 0.19 t | 2002 | 0.43 t | 2021 | 0.71 t |
| 1984 | 0.18 t | 2003 | 0.47 t | 2022 | 0.62 t |
| 1985 | 0.18 t | 2004 | 0.52 t | 2023 | 0.63 t |
| 1986 | 0.2 t | 2005 | 0.55 t | 2024 | 0.63 t |
| 1987 | 0.27 t | 2006 | 0.57 t | | |
| 1988 | 0.24 t | 2007 | 0.58 t | | |