Show data table
| 1970 | 43.9 Mt | 1989 | 60.45 Mt | 2008 | 41.16 Mt |
| 1971 | 43.86 Mt | 1990 | 60.63 Mt | 2009 | 37.23 Mt |
| 1972 | 44.6 Mt | 1991 | 52.67 Mt | 2010 | 39.91 Mt |
| 1973 | 45.99 Mt | 1992 | 49.2 Mt | 2011 | 37.89 Mt |
| 1974 | 46.74 Mt | 1993 | 48.17 Mt | 2012 | 36.11 Mt |
| 1975 | 48.17 Mt | 1994 | 45.4 Mt | 2013 | 36.38 Mt |
| 1976 | 49.17 Mt | 1995 | 45.76 Mt | 2014 | 33.99 Mt |
| 1977 | 51.21 Mt | 1996 | 45.99 Mt | 2015 | 34.53 Mt |
| 1978 | 57.44 Mt | 1997 | 45.56 Mt | 2016 | 35.44 Mt |
| 1979 | 58.7 Mt | 1998 | 44.67 Mt | 2017 | 37.73 Mt |
| 1980 | 62.75 Mt | 1999 | 43.89 Mt | 2018 | 37.24 Mt |
| 1981 | 60.85 Mt | 2000 | 41.68 Mt | 2019 | 34.81 Mt |
| 1982 | 59.09 Mt | 2001 | 41.98 Mt | 2020 | 32.64 Mt |
| 1983 | 58.86 Mt | 2002 | 41.95 Mt | 2021 | 36.65 Mt |
| 1984 | 61.06 Mt | 2003 | 42.4 Mt | 2022 | 33.19 Mt |
| 1985 | 60.82 Mt | 2004 | 41.84 Mt | 2023 | 31.15 Mt |
| 1986 | 58 Mt | 2005 | 42.24 Mt | 2024 | 29.89 Mt |
| 1987 | 59.83 Mt | 2006 | 42.26 Mt | | |
| 1988 | 60.88 Mt | 2007 | 41.34 Mt | | |
Show data table
| 1970 | 9.67 t | 1989 | 11.46 t | 2008 | 7.65 t |
| 1971 | 9.62 t | 1990 | 11.44 t | 2009 | 6.91 t |
| 1972 | 9.7 t | 1991 | 9.93 t | 2010 | 7.4 t |
| 1973 | 9.91 t | 1992 | 9.27 t | 2011 | 7.02 t |
| 1974 | 9.97 t | 1993 | 9.05 t | 2012 | 6.68 t |
| 1975 | 10.16 t | 1994 | 8.49 t | 2013 | 6.72 t |
| 1976 | 10.27 t | 1995 | 8.53 t | 2014 | 6.27 t |
| 1977 | 10.58 t | 1996 | 8.56 t | 2015 | 6.37 t |
| 1978 | 11.75 t | 1997 | 8.46 t | 2016 | 6.53 t |
| 1979 | 11.88 t | 1998 | 8.29 t | 2017 | 6.94 t |
| 1980 | 12.6 t | 1999 | 8.13 t | 2018 | 6.84 t |
| 1981 | 12.13 t | 2000 | 7.74 t | 2019 | 6.38 t |
| 1982 | 11.69 t | 2001 | 7.8 t | 2020 | 5.98 t |
| 1983 | 11.56 t | 2002 | 7.8 t | 2021 | 6.73 t |
| 1984 | 11.91 t | 2003 | 7.89 t | 2022 | 6.11 t |
| 1985 | 11.78 t | 2004 | 7.79 t | 2023 | 5.74 t |
| 1986 | 11.17 t | 2005 | 7.86 t | 2024 | 5.51 t |
| 1987 | 11.46 t | 2006 | 7.86 t | | |
| 1988 | 11.6 t | 2007 | 7.69 t | | |