Show data table
| 1970 | 474.51 Mt | 1989 | 711.94 Mt | 2008 | 352.23 Mt |
| 1971 | 474.15 Mt | 1990 | 785.54 Mt | 2009 | 292.23 Mt |
| 1972 | 499.65 Mt | 1991 | 741.07 Mt | 2010 | 315.91 Mt |
| 1973 | 529.28 Mt | 1992 | 650.41 Mt | 2011 | 333.31 Mt |
| 1974 | 553.26 Mt | 1993 | 567.88 Mt | 2012 | 324.92 Mt |
| 1975 | 579.49 Mt | 1994 | 470.16 Mt | 2013 | 315.27 Mt |
| 1976 | 597.17 Mt | 1995 | 464.19 Mt | 2014 | 269.33 Mt |
| 1977 | 607.48 Mt | 1996 | 397.63 Mt | 2015 | 226.11 Mt |
| 1978 | 647.7 Mt | 1997 | 382.24 Mt | 2016 | 227.25 Mt |
| 1979 | 661.38 Mt | 1998 | 364.61 Mt | 2017 | 205.58 Mt |
| 1980 | 679.26 Mt | 1999 | 364.36 Mt | 2018 | 218.3 Mt |
| 1981 | 668.73 Mt | 2000 | 361.03 Mt | 2019 | 207.91 Mt |
| 1982 | 666.77 Mt | 2001 | 360.17 Mt | 2020 | 198.9 Mt |
| 1983 | 667.33 Mt | 2002 | 360.56 Mt | 2021 | 194.14 Mt |
| 1984 | 670.28 Mt | 2003 | 392.98 Mt | 2022 | 119.34 Mt |
| 1985 | 672.3 Mt | 2004 | 368.82 Mt | 2023 | 121.7 Mt |
| 1986 | 686.42 Mt | 2005 | 357.09 Mt | 2024 | 118.48 Mt |
| 1987 | 707.75 Mt | 2006 | 356.38 Mt | | |
| 1988 | 715.79 Mt | 2007 | 367.7 Mt | | |
Show data table
| 1970 | 10.04 t | 1989 | 13.71 t | 2008 | 7.52 t |
| 1971 | 9.97 t | 1990 | 15.09 t | 2009 | 6.27 t |
| 1972 | 10.42 t | 1991 | 14.2 t | 2010 | 6.8 t |
| 1973 | 10.96 t | 1992 | 12.43 t | 2011 | 7.2 t |
| 1974 | 11.39 t | 1993 | 10.85 t | 2012 | 7.03 t |
| 1975 | 11.86 t | 1994 | 9.03 t | 2013 | 6.83 t |
| 1976 | 12.16 t | 1995 | 8.98 t | 2014 | 5.86 t |
| 1977 | 12.31 t | 1996 | 7.76 t | 2015 | 4.94 t |
| 1978 | 13.08 t | 1997 | 7.53 t | 2016 | 4.98 t |
| 1979 | 13.3 t | 1998 | 7.24 t | 2017 | 4.52 t |
| 1980 | 13.6 t | 1999 | 7.29 t | 2018 | 4.83 t |
| 1981 | 13.32 t | 2000 | 7.29 t | 2019 | 4.62 t |
| 1982 | 13.23 t | 2001 | 7.33 t | 2020 | 4.45 t |
| 1983 | 13.18 t | 2002 | 7.41 t | 2021 | 4.38 t |
| 1984 | 13.17 t | 2003 | 8.13 t | 2022 | 2.91 t |
| 1985 | 13.15 t | 2004 | 7.69 t | 2023 | 3.23 t |
| 1986 | 13.38 t | 2005 | 7.5 t | 2024 | 3.13 t |
| 1987 | 13.74 t | 2006 | 7.54 t | | |
| 1988 | 13.84 t | 2007 | 7.81 t | | |