Show data table
| 1970 | 21.9 Mt | 1989 | 41.72 Mt | 2008 | 26.67 Mt |
| 1971 | 22.07 Mt | 1990 | 38.66 Mt | 2009 | 26.94 Mt |
| 1972 | 21.7 Mt | 1991 | 30.13 Mt | 2010 | 28.18 Mt |
| 1973 | 23.39 Mt | 1992 | 23.92 Mt | 2011 | 27.75 Mt |
| 1974 | 25.37 Mt | 1993 | 21.87 Mt | 2012 | 28.89 Mt |
| 1975 | 26.08 Mt | 1994 | 22.5 Mt | 2013 | 29.02 Mt |
| 1976 | 27.52 Mt | 1995 | 23.94 Mt | 2014 | 26.91 Mt |
| 1977 | 30 Mt | 1996 | 25.93 Mt | 2015 | 29.44 Mt |
| 1978 | 32.16 Mt | 1997 | 28.38 Mt | 2016 | 27.3 Mt |
| 1979 | 32.57 Mt | 1998 | 27.86 Mt | 2017 | 26.51 Mt |
| 1980 | 33.41 Mt | 1999 | 28.64 Mt | 2018 | 26.78 Mt |
| 1981 | 33.66 Mt | 2000 | 29 Mt | 2019 | 22.29 Mt |
| 1982 | 33.47 Mt | 2001 | 27.82 Mt | 2020 | 18.48 Mt |
| 1983 | 36.04 Mt | 2002 | 26.57 Mt | 2021 | 21.76 Mt |
| 1984 | 38.03 Mt | 2003 | 25.8 Mt | 2022 | 19.76 Mt |
| 1985 | 35.4 Mt | 2004 | 25.32 Mt | 2023 | 20.03 Mt |
| 1986 | 36.03 Mt | 2005 | 26.21 Mt | 2024 | 21 Mt |
| 1987 | 39.25 Mt | 2006 | 26.79 Mt | | |
| 1988 | 40.93 Mt | 2007 | 27.61 Mt | | |
Show data table
| 1970 | 2.48 t | 1989 | 3.96 t | 2008 | 2.36 t |
| 1971 | 2.46 t | 1990 | 3.64 t | 2009 | 2.39 t |
| 1972 | 2.38 t | 1991 | 2.81 t | 2010 | 2.49 t |
| 1973 | 2.53 t | 1992 | 2.22 t | 2011 | 2.46 t |
| 1974 | 2.71 t | 1993 | 2.02 t | 2012 | 2.56 t |
| 1975 | 2.75 t | 1994 | 2.07 t | 2013 | 2.57 t |
| 1976 | 2.88 t | 1995 | 2.19 t | 2014 | 2.38 t |
| 1977 | 3.11 t | 1996 | 2.37 t | 2015 | 2.61 t |
| 1978 | 3.31 t | 1997 | 2.58 t | 2016 | 2.42 t |
| 1979 | 3.34 t | 1998 | 2.53 t | 2017 | 2.36 t |
| 1980 | 3.41 t | 1999 | 2.59 t | 2018 | 2.39 t |
| 1981 | 3.42 t | 2000 | 2.61 t | 2019 | 1.99 t |
| 1982 | 3.38 t | 2001 | 2.5 t | 2020 | 1.65 t |
| 1983 | 3.61 t | 2002 | 2.38 t | 2021 | 1.96 t |
| 1984 | 3.78 t | 2003 | 2.3 t | 2022 | 1.79 t |
| 1985 | 3.48 t | 2004 | 2.25 t | 2023 | 1.82 t |
| 1986 | 3.52 t | 2005 | 2.33 t | 2024 | 1.91 t |
| 1987 | 3.8 t | 2006 | 2.38 t | | |
| 1988 | 3.92 t | 2007 | 2.45 t | | |