Show data table
| 1970 | 1.6276 Mt | 1989 | 7.0879 Mt | 2008 | 25.25 Mt |
| 1971 | 1.6408 Mt | 1990 | 7.1074 Mt | 2009 | 27.63 Mt |
| 1972 | 1.9251 Mt | 1991 | 8.9024 Mt | 2010 | 26.34 Mt |
| 1973 | 2.3423 Mt | 1992 | 9.5953 Mt | 2011 | 23 Mt |
| 1974 | 2.3311 Mt | 1993 | 8.6788 Mt | 2012 | 22 Mt |
| 1975 | 2.2324 Mt | 1994 | 10.03 Mt | 2013 | 28.79 Mt |
| 1976 | 2.7308 Mt | 1995 | 11.16 Mt | 2014 | 28.36 Mt |
| 1977 | 2.7766 Mt | 1996 | 11.42 Mt | 2015 | 14.25 Mt |
| 1978 | 3.0455 Mt | 1997 | 12.29 Mt | 2016 | 10.63 Mt |
| 1979 | 3.2564 Mt | 1998 | 13.08 Mt | 2017 | 9.826 Mt |
| 1980 | 4.1024 Mt | 1999 | 14.74 Mt | 2018 | 11.99 Mt |
| 1981 | 4.1161 Mt | 2000 | 15.75 Mt | 2019 | 12.34 Mt |
| 1982 | 4.5913 Mt | 2001 | 16.77 Mt | 2020 | 11.32 Mt |
| 1983 | 5.05 Mt | 2002 | 16.82 Mt | 2021 | 11.22 Mt |
| 1984 | 5.165 Mt | 2003 | 19.54 Mt | 2022 | 10.98 Mt |
| 1985 | 5.5125 Mt | 2004 | 20.44 Mt | 2023 | 10.63 Mt |
| 1986 | 5.8201 Mt | 2005 | 22.02 Mt | 2024 | 10.58 Mt |
| 1987 | 6.3752 Mt | 2006 | 22.95 Mt | | |
| 1988 | 6.867 Mt | 2007 | 24.32 Mt | | |
Show data table
| 1970 | 0.23 t | 1989 | 0.53 t | 2008 | 1.01 t |
| 1971 | 0.23 t | 1990 | 0.51 t | 2009 | 1.07 t |
| 1972 | 0.26 t | 1991 | 0.62 t | 2010 | 0.98 t |
| 1973 | 0.31 t | 1992 | 0.64 t | 2011 | 0.83 t |
| 1974 | 0.3 t | 1993 | 0.56 t | 2012 | 0.77 t |
| 1975 | 0.27 t | 1994 | 0.62 t | 2013 | 0.98 t |
| 1976 | 0.33 t | 1995 | 0.67 t | 2014 | 0.94 t |
| 1977 | 0.32 t | 1996 | 0.66 t | 2015 | 0.46 t |
| 1978 | 0.34 t | 1997 | 0.69 t | 2016 | 0.33 t |
| 1979 | 0.35 t | 1998 | 0.71 t | 2017 | 0.3 t |
| 1980 | 0.43 t | 1999 | 0.77 t | 2018 | 0.35 t |
| 1981 | 0.42 t | 2000 | 0.8 t | 2019 | 0.35 t |
| 1982 | 0.45 t | 2001 | 0.83 t | 2020 | 0.31 t |
| 1983 | 0.48 t | 2002 | 0.81 t | 2021 | 0.3 t |
| 1984 | 0.47 t | 2003 | 0.91 t | 2022 | 0.29 t |
| 1985 | 0.48 t | 2004 | 0.93 t | 2023 | 0.27 t |
| 1986 | 0.49 t | 2005 | 0.97 t | 2024 | 0.26 t |
| 1987 | 0.52 t | 2006 | 0.97 t | | |
| 1988 | 0.53 t | 2007 | 1 t | | |