Show data table
| 1970 | 1.4413 Mt | 1989 | 1.0572 Mt | 2008 | 1.3616 Mt |
| 1971 | 1.4639 Mt | 1990 | 1.0865 Mt | 2009 | 1.1324 Mt |
| 1972 | 1.7257 Mt | 1991 | 0.9817 Mt | 2010 | 1.283 Mt |
| 1973 | 1.7181 Mt | 1992 | 0.8467 Mt | 2011 | 0.8542 Mt |
| 1974 | 1.5017 Mt | 1993 | 0.8703 Mt | 2012 | 1.0171 Mt |
| 1975 | 1.537 Mt | 1994 | 0.9648 Mt | 2013 | 1.0911 Mt |
| 1976 | 1.3567 Mt | 1995 | 1.1156 Mt | 2014 | 1.1363 Mt |
| 1977 | 1.5065 Mt | 1996 | 1.2452 Mt | 2015 | 1.1204 Mt |
| 1978 | 1.5277 Mt | 1997 | 1.2557 Mt | 2016 | 1.2455 Mt |
| 1979 | 1.574 Mt | 1998 | 1.4427 Mt | 2017 | 1.3738 Mt |
| 1980 | 1.5462 Mt | 1999 | 1.2965 Mt | 2018 | 1.2106 Mt |
| 1981 | 1.3599 Mt | 2000 | 0.9973 Mt | 2019 | 1.4505 Mt |
| 1982 | 1.1152 Mt | 2001 | 0.9927 Mt | 2020 | 1.1733 Mt |
| 1983 | 0.8216 Mt | 2002 | 1.0869 Mt | 2021 | 1.4488 Mt |
| 1984 | 0.8061 Mt | 2003 | 0.8096 Mt | 2022 | 1.4055 Mt |
| 1985 | 0.7143 Mt | 2004 | 0.874 Mt | 2023 | 1.4098 Mt |
| 1986 | 0.748 Mt | 2005 | 0.8606 Mt | 2024 | 1.4592 Mt |
| 1987 | 0.8836 Mt | 2006 | 1.0954 Mt | | |
| 1988 | 0.9027 Mt | 2007 | 1.3138 Mt | | |
Show data table
| 1970 | 7.79 t | 1989 | 3.9 t | 2008 | 3.8 t |
| 1971 | 7.67 t | 1990 | 3.94 t | 2009 | 3.12 t |
| 1972 | 8.8 t | 1991 | 3.5 t | 2010 | 3.49 t |
| 1973 | 8.56 t | 1992 | 2.96 t | 2011 | 2.3 t |
| 1974 | 7.31 t | 1993 | 2.99 t | 2012 | 2.71 t |
| 1975 | 7.32 t | 1994 | 3.25 t | 2013 | 2.88 t |
| 1976 | 6.32 t | 1995 | 3.7 t | 2014 | 2.97 t |
| 1977 | 6.87 t | 1996 | 4.07 t | 2015 | 2.91 t |
| 1978 | 6.83 t | 1997 | 4.04 t | 2016 | 3.21 t |
| 1979 | 6.9 t | 1998 | 4.57 t | 2017 | 3.52 t |
| 1980 | 6.65 t | 1999 | 4.06 t | 2018 | 3.08 t |
| 1981 | 5.75 t | 2000 | 3.08 t | 2019 | 3.68 t |
| 1982 | 4.63 t | 2001 | 3.03 t | 2020 | 2.96 t |
| 1983 | 3.36 t | 2002 | 3.28 t | 2021 | 3.66 t |
| 1984 | 3.24 t | 2003 | 2.41 t | 2022 | 3.54 t |
| 1985 | 2.82 t | 2004 | 2.57 t | 2023 | 3.53 t |
| 1986 | 2.9 t | 2005 | 2.5 t | 2024 | 3.64 t |
| 1987 | 3.37 t | 2006 | 3.14 t | | |
| 1988 | 3.39 t | 2007 | 3.72 t | | |