Show data table
| 1970 | 23.93 Mt | 1989 | 30.65 Mt | 2008 | 5.681 Mt |
| 1971 | 23.66 Mt | 1990 | 34.49 Mt | 2009 | 6.4713 Mt |
| 1972 | 25.13 Mt | 1991 | 26.61 Mt | 2010 | 6.3124 Mt |
| 1973 | 26.64 Mt | 1992 | 20.92 Mt | 2011 | 7.5848 Mt |
| 1974 | 27.93 Mt | 1993 | 16.75 Mt | 2012 | 8.2738 Mt |
| 1975 | 29.93 Mt | 1994 | 10.92 Mt | 2013 | 9.1493 Mt |
| 1976 | 30.43 Mt | 1995 | 8.5229 Mt | 2014 | 9.8404 Mt |
| 1977 | 30.74 Mt | 1996 | 6.9003 Mt | 2015 | 10.65 Mt |
| 1978 | 31.53 Mt | 1997 | 6.0515 Mt | 2016 | 11.03 Mt |
| 1979 | 32.62 Mt | 1998 | 5.4875 Mt | 2017 | 11.17 Mt |
| 1980 | 33.5 Mt | 1999 | 4.8888 Mt | 2018 | 11.14 Mt |
| 1981 | 33.9 Mt | 2000 | 5.2126 Mt | 2019 | 11.92 Mt |
| 1982 | 33.5 Mt | 2001 | 3.8788 Mt | 2020 | 11.54 Mt |
| 1983 | 32.92 Mt | 2002 | 3.5935 Mt | 2021 | 12.34 Mt |
| 1984 | 32.64 Mt | 2003 | 3.9559 Mt | 2022 | 13.46 Mt |
| 1985 | 32.2 Mt | 2004 | 4.3124 Mt | 2023 | 13.56 Mt |
| 1986 | 31.91 Mt | 2005 | 4.9793 Mt | 2024 | 13.47 Mt |
| 1987 | 32.32 Mt | 2006 | 5.6816 Mt | | |
| 1988 | 31.84 Mt | 2007 | 6.5959 Mt | | |
Show data table
| 1970 | 5.81 t | 1989 | 6.38 t | 2008 | 1.48 t |
| 1971 | 5.68 t | 1990 | 7.18 t | 2009 | 1.7 t |
| 1972 | 5.98 t | 1991 | 5.5 t | 2010 | 1.67 t |
| 1973 | 6.28 t | 1992 | 4.29 t | 2011 | 2.02 t |
| 1974 | 6.53 t | 1993 | 3.41 t | 2012 | 2.22 t |
| 1975 | 6.94 t | 1994 | 2.26 t | 2013 | 2.46 t |
| 1976 | 7.01 t | 1995 | 1.83 t | 2014 | 2.65 t |
| 1977 | 7.03 t | 1996 | 1.54 t | 2015 | 2.86 t |
| 1978 | 7.17 t | 1997 | 1.39 t | 2016 | 2.96 t |
| 1979 | 7.36 t | 1998 | 1.29 t | 2017 | 3 t |
| 1980 | 7.5 t | 1999 | 1.18 t | 2018 | 2.99 t |
| 1981 | 7.53 t | 2000 | 1.28 t | 2019 | 3.2 t |
| 1982 | 7.37 t | 2001 | 0.97 t | 2020 | 3.1 t |
| 1983 | 7.18 t | 2002 | 0.9 t | 2021 | 3.33 t |
| 1984 | 7.06 t | 2003 | 1 t | 2022 | 3.63 t |
| 1985 | 6.91 t | 2004 | 1.1 t | 2023 | 3.65 t |
| 1986 | 6.78 t | 2005 | 1.28 t | 2024 | 3.64 t |
| 1987 | 6.81 t | 2006 | 1.46 t | | |
| 1988 | 6.65 t | 2007 | 1.71 t | | |