Show data table
| 1970 | 188.29 Mt | 1989 | 183.09 Mt | 2008 | 126.12 Mt |
| 1971 | 188.55 Mt | 1990 | 165.5 Mt | 2009 | 119.71 Mt |
| 1972 | 188.49 Mt | 1991 | 150.16 Mt | 2010 | 120.99 Mt |
| 1973 | 186.53 Mt | 1992 | 144.38 Mt | 2011 | 118.12 Mt |
| 1974 | 169.77 Mt | 1993 | 139.85 Mt | 2012 | 114.03 Mt |
| 1975 | 177.05 Mt | 1994 | 134.36 Mt | 2013 | 109.53 Mt |
| 1976 | 182.46 Mt | 1995 | 133.59 Mt | 2014 | 107.24 Mt |
| 1977 | 192.95 Mt | 1996 | 137.4 Mt | 2015 | 108.29 Mt |
| 1978 | 190.78 Mt | 1997 | 134.01 Mt | 2016 | 109.81 Mt |
| 1979 | 200.52 Mt | 1998 | 127.97 Mt | 2017 | 110.38 Mt |
| 1980 | 193.52 Mt | 1999 | 119.72 Mt | 2018 | 109.34 Mt |
| 1981 | 194.17 Mt | 2000 | 132.32 Mt | 2019 | 103.78 Mt |
| 1982 | 196.16 Mt | 2001 | 132.23 Mt | 2020 | 94.86 Mt |
| 1983 | 196.81 Mt | 2002 | 127.4 Mt | 2021 | 99.52 Mt |
| 1984 | 199.36 Mt | 2003 | 130.67 Mt | 2022 | 97.69 Mt |
| 1985 | 196.76 Mt | 2004 | 131.53 Mt | 2023 | 85.61 Mt |
| 1986 | 194.8 Mt | 2005 | 129.05 Mt | 2024 | 77.75 Mt |
| 1987 | 194.65 Mt | 2006 | 130.79 Mt | | |
| 1988 | 190.63 Mt | 2007 | 132.34 Mt | | |
Show data table
| 1970 | 19.1 t | 1989 | 17.67 t | 2008 | 12.14 t |
| 1971 | 19.19 t | 1990 | 16.02 t | 2009 | 11.46 t |
| 1972 | 19.1 t | 1991 | 14.57 t | 2010 | 11.55 t |
| 1973 | 18.8 t | 1992 | 13.99 t | 2011 | 11.25 t |
| 1974 | 17 t | 1993 | 13.54 t | 2012 | 10.85 t |
| 1975 | 17.6 t | 1994 | 13 t | 2013 | 10.42 t |
| 1976 | 18.02 t | 1995 | 12.94 t | 2014 | 10.19 t |
| 1977 | 18.94 t | 1996 | 13.32 t | 2015 | 10.27 t |
| 1978 | 18.63 t | 1997 | 13.01 t | 2016 | 10.39 t |
| 1979 | 19.48 t | 1998 | 12.43 t | 2017 | 10.42 t |
| 1980 | 18.78 t | 1999 | 11.64 t | 2018 | 10.29 t |
| 1981 | 18.85 t | 2000 | 12.9 t | 2019 | 9.72 t |
| 1982 | 19.02 t | 2001 | 12.94 t | 2020 | 8.87 t |
| 1983 | 19.06 t | 2002 | 12.49 t | 2021 | 9.47 t |
| 1984 | 19.3 t | 2003 | 12.82 t | 2022 | 9.15 t |
| 1985 | 19.03 t | 2004 | 12.9 t | 2023 | 7.88 t |
| 1986 | 18.84 t | 2005 | 12.64 t | 2024 | 7.13 t |
| 1987 | 18.81 t | 2006 | 12.77 t | | |
| 1988 | 18.41 t | 2007 | 12.85 t | | |