Show data table
| 1970 | 15.88 Mt | 1989 | 31.97 Mt | 2008 | 23.32 Mt |
| 1971 | 16.11 Mt | 1990 | 24.02 Mt | 2009 | 21.67 Mt |
| 1972 | 15.79 Mt | 1991 | 17.74 Mt | 2010 | 20.94 Mt |
| 1973 | 17.32 Mt | 1992 | 16.39 Mt | 2011 | 20.45 Mt |
| 1974 | 18.66 Mt | 1993 | 16.65 Mt | 2012 | 18.79 Mt |
| 1975 | 19.71 Mt | 1994 | 15.97 Mt | 2013 | 18.38 Mt |
| 1976 | 19.42 Mt | 1995 | 16.5 Mt | 2014 | 17.68 Mt |
| 1977 | 19.84 Mt | 1996 | 17.2 Mt | 2015 | 18.02 Mt |
| 1978 | 21.38 Mt | 1997 | 18.31 Mt | 2016 | 18.27 Mt |
| 1979 | 22.44 Mt | 1998 | 19.03 Mt | 2017 | 18.8 Mt |
| 1980 | 20.82 Mt | 1999 | 19.94 Mt | 2018 | 17.77 Mt |
| 1981 | 22.64 Mt | 2000 | 19.38 Mt | 2019 | 17.97 Mt |
| 1982 | 23.81 Mt | 2001 | 20.54 Mt | 2020 | 17.19 Mt |
| 1983 | 27.6 Mt | 2002 | 21.36 Mt | 2021 | 17.51 Mt |
| 1984 | 27.88 Mt | 2003 | 22.75 Mt | 2022 | 17.63 Mt |
| 1985 | 28.66 Mt | 2004 | 22.73 Mt | 2023 | 18.66 Mt |
| 1986 | 31.18 Mt | 2005 | 22.85 Mt | 2024 | 18.68 Mt |
| 1987 | 30.41 Mt | 2006 | 23.04 Mt | | |
| 1988 | 33.42 Mt | 2007 | 24.51 Mt | | |
Show data table
| 1970 | 3.6 t | 1989 | 6.71 t | 2008 | 5.41 t |
| 1971 | 3.64 t | 1990 | 5.03 t | 2009 | 5.03 t |
| 1972 | 3.55 t | 1991 | 3.78 t | 2010 | 4.88 t |
| 1973 | 3.88 t | 1992 | 3.58 t | 2011 | 4.78 t |
| 1974 | 4.16 t | 1993 | 3.62 t | 2012 | 4.41 t |
| 1975 | 4.37 t | 1994 | 3.43 t | 2013 | 4.34 t |
| 1976 | 4.28 t | 1995 | 3.57 t | 2014 | 4.21 t |
| 1977 | 4.35 t | 1996 | 3.78 t | 2015 | 4.34 t |
| 1978 | 4.67 t | 1997 | 4.04 t | 2016 | 4.45 t |
| 1979 | 4.88 t | 1998 | 4.2 t | 2017 | 4.65 t |
| 1980 | 4.53 t | 1999 | 4.42 t | 2018 | 4.45 t |
| 1981 | 4.91 t | 2000 | 4.34 t | 2019 | 4.55 t |
| 1982 | 5.14 t | 2001 | 4.78 t | 2020 | 4.39 t |
| 1983 | 5.93 t | 2002 | 4.96 t | 2021 | 4.51 t |
| 1984 | 5.96 t | 2003 | 5.29 t | 2022 | 4.57 t |
| 1985 | 6.1 t | 2004 | 5.28 t | 2023 | 4.84 t |
| 1986 | 6.6 t | 2005 | 5.3 t | 2024 | 4.83 t |
| 1987 | 6.42 t | 2006 | 5.34 t | | |
| 1988 | 7.03 t | 2007 | 5.69 t | | |