Show data table
| 1970 | 8.9339 Mt | 1989 | 15.1 Mt | 2008 | 19.12 Mt |
| 1971 | 8.5196 Mt | 1990 | 11.23 Mt | 2009 | 21.09 Mt |
| 1972 | 10.37 Mt | 1991 | 11.78 Mt | 2010 | 22.74 Mt |
| 1973 | 11.35 Mt | 1992 | 12.12 Mt | 2011 | 23.65 Mt |
| 1974 | 11.81 Mt | 1993 | 12.14 Mt | 2012 | 24.72 Mt |
| 1975 | 10.9 Mt | 1994 | 11.49 Mt | 2013 | 28.53 Mt |
| 1976 | 7.292 Mt | 1995 | 12.95 Mt | 2014 | 30.89 Mt |
| 1977 | 12.03 Mt | 1996 | 15.68 Mt | 2015 | 33.09 Mt |
| 1978 | 14.22 Mt | 1997 | 16.4 Mt | 2016 | 31.27 Mt |
| 1979 | 14.18 Mt | 1998 | 17.04 Mt | 2017 | 28 Mt |
| 1980 | 14.32 Mt | 1999 | 18.03 Mt | 2018 | 25.81 Mt |
| 1981 | 13.23 Mt | 2000 | 16.51 Mt | 2019 | 27 Mt |
| 1982 | 12.77 Mt | 2001 | 16.19 Mt | 2020 | 20.54 Mt |
| 1983 | 13.22 Mt | 2002 | 15.92 Mt | 2021 | 25.56 Mt |
| 1984 | 13.36 Mt | 2003 | 17.33 Mt | 2022 | 26.68 Mt |
| 1985 | 14.1 Mt | 2004 | 17.69 Mt | 2023 | 27.34 Mt |
| 1986 | 14.25 Mt | 2005 | 15.64 Mt | 2024 | 28.1 Mt |
| 1987 | 14.5 Mt | 2006 | 16.32 Mt | | |
| 1988 | 14.94 Mt | 2007 | 17.06 Mt | | |
Show data table
| 1970 | 1.53 t | 1989 | 1.34 t | 2008 | 0.89 t |
| 1971 | 1.42 t | 1990 | 0.97 t | 2009 | 0.94 t |
| 1972 | 1.68 t | 1991 | 0.98 t | 2010 | 0.98 t |
| 1973 | 1.78 t | 1992 | 0.98 t | 2011 | 0.98 t |
| 1974 | 1.79 t | 1993 | 0.95 t | 2012 | 0.98 t |
| 1975 | 1.59 t | 1994 | 0.87 t | 2013 | 1.09 t |
| 1976 | 1.03 t | 1995 | 0.95 t | 2014 | 1.14 t |
| 1977 | 1.64 t | 1996 | 1.11 t | 2015 | 1.18 t |
| 1978 | 1.88 t | 1997 | 1.12 t | 2016 | 1.07 t |
| 1979 | 1.81 t | 1998 | 1.12 t | 2017 | 0.93 t |
| 1980 | 1.76 t | 1999 | 1.15 t | 2018 | 0.82 t |
| 1981 | 1.57 t | 2000 | 1.02 t | 2019 | 0.83 t |
| 1982 | 1.46 t | 2001 | 0.97 t | 2020 | 0.61 t |
| 1983 | 1.46 t | 2002 | 0.92 t | 2021 | 0.74 t |
| 1984 | 1.42 t | 2003 | 0.97 t | 2022 | 0.75 t |
| 1985 | 1.44 t | 2004 | 0.95 t | 2023 | 0.74 t |
| 1986 | 1.41 t | 2005 | 0.81 t | 2024 | 0.74 t |
| 1987 | 1.38 t | 2006 | 0.82 t | | |
| 1988 | 1.38 t | 2007 | 0.82 t | | |