Show data table
| 1970 | 66.28 Mt | 1989 | 81.11 Mt | 2008 | 57.84 Mt |
| 1971 | 67.93 Mt | 1990 | 72.33 Mt | 2009 | 51.7 Mt |
| 1972 | 70.06 Mt | 1991 | 68.43 Mt | 2010 | 52.35 Mt |
| 1973 | 74.88 Mt | 1992 | 61.72 Mt | 2011 | 51.44 Mt |
| 1974 | 76.92 Mt | 1993 | 62.71 Mt | 2012 | 47.65 Mt |
| 1975 | 78.42 Mt | 1994 | 62.46 Mt | 2013 | 44.8 Mt |
| 1976 | 82.39 Mt | 1995 | 62.37 Mt | 2014 | 44.83 Mt |
| 1977 | 86.28 Mt | 1996 | 63.59 Mt | 2015 | 47.54 Mt |
| 1978 | 93.7 Mt | 1997 | 62.3 Mt | 2016 | 48.27 Mt |
| 1979 | 92.34 Mt | 1998 | 62.21 Mt | 2017 | 51.13 Mt |
| 1980 | 91.61 Mt | 1999 | 62.61 Mt | 2018 | 51.26 Mt |
| 1981 | 90.37 Mt | 2000 | 59.46 Mt | 2019 | 51.5 Mt |
| 1982 | 90.56 Mt | 2001 | 61.01 Mt | 2020 | 49.65 Mt |
| 1983 | 86.85 Mt | 2002 | 59.98 Mt | 2021 | 50.99 Mt |
| 1984 | 88.41 Mt | 2003 | 62.68 Mt | 2022 | 47.57 Mt |
| 1985 | 88.35 Mt | 2004 | 60.82 Mt | 2023 | 42.98 Mt |
| 1986 | 86.96 Mt | 2005 | 61.22 Mt | 2024 | 42.63 Mt |
| 1987 | 88.07 Mt | 2006 | 60.68 Mt | | |
| 1988 | 83.36 Mt | 2007 | 59.15 Mt | | |
Show data table
| 1970 | 6.41 t | 1989 | 7.74 t | 2008 | 5.76 t |
| 1971 | 6.55 t | 1990 | 6.97 t | 2009 | 5.16 t |
| 1972 | 6.74 t | 1991 | 6.6 t | 2010 | 5.23 t |
| 1973 | 7.18 t | 1992 | 5.95 t | 2011 | 5.16 t |
| 1974 | 7.34 t | 1993 | 6.05 t | 2012 | 4.8 t |
| 1975 | 7.44 t | 1994 | 6.04 t | 2013 | 4.54 t |
| 1976 | 7.77 t | 1995 | 6.04 t | 2014 | 4.56 t |
| 1977 | 8.1 t | 1996 | 6.17 t | 2015 | 4.85 t |
| 1978 | 8.77 t | 1997 | 6.05 t | 2016 | 4.95 t |
| 1979 | 8.63 t | 1998 | 6.06 t | 2017 | 5.26 t |
| 1980 | 8.55 t | 1999 | 6.12 t | 2018 | 5.28 t |
| 1981 | 8.44 t | 2000 | 5.82 t | 2019 | 5.31 t |
| 1982 | 8.46 t | 2001 | 5.99 t | 2020 | 5.13 t |
| 1983 | 8.12 t | 2002 | 5.9 t | 2021 | 5.29 t |
| 1984 | 8.29 t | 2003 | 6.19 t | 2022 | 4.95 t |
| 1985 | 8.3 t | 2004 | 6.02 t | 2023 | 4.48 t |
| 1986 | 8.18 t | 2005 | 6.07 t | 2024 | 4.46 t |
| 1987 | 8.3 t | 2006 | 6.02 t | | |
| 1988 | 7.87 t | 2007 | 5.88 t | | |