Show data table
| 1970 | 39.84 Mt | 1989 | 66.27 Mt | 2008 | 83.61 Mt |
| 1971 | 42.2 Mt | 1990 | 32.41 Mt | 2009 | 85.32 Mt |
| 1972 | 42.45 Mt | 1991 | 38.5 Mt | 2010 | 86.82 Mt |
| 1973 | 38.08 Mt | 1992 | 26.96 Mt | 2011 | 91.87 Mt |
| 1974 | 31.16 Mt | 1993 | 34.28 Mt | 2012 | 91.96 Mt |
| 1975 | 26.77 Mt | 1994 | 40.73 Mt | 2013 | 93.87 Mt |
| 1976 | 27.4 Mt | 1995 | 40.31 Mt | 2014 | 92.33 Mt |
| 1977 | 27.01 Mt | 1996 | 39.65 Mt | 2015 | 95.59 Mt |
| 1978 | 31.02 Mt | 1997 | 41.75 Mt | 2016 | 98.4 Mt |
| 1979 | 35.51 Mt | 1998 | 46.33 Mt | 2017 | 97.46 Mt |
| 1980 | 33.28 Mt | 1999 | 49.89 Mt | 2018 | 99.08 Mt |
| 1981 | 31.55 Mt | 2000 | 56.02 Mt | 2019 | 96.83 Mt |
| 1982 | 33.65 Mt | 2001 | 58.87 Mt | 2020 | 92.95 Mt |
| 1983 | 36.26 Mt | 2002 | 61.58 Mt | 2021 | 99.9 Mt |
| 1984 | 36.93 Mt | 2003 | 64.92 Mt | 2022 | 102.62 Mt |
| 1985 | 40.84 Mt | 2004 | 68.98 Mt | 2023 | 110.16 Mt |
| 1986 | 43.94 Mt | 2005 | 77.23 Mt | 2024 | 115.93 Mt |
| 1987 | 47.21 Mt | 2006 | 79.93 Mt | | |
| 1988 | 56.73 Mt | 2007 | 78.22 Mt | | |
Show data table
| 1970 | 49.24 t | 1989 | 29.89 t | 2008 | 31.54 t |
| 1971 | 48.78 t | 1990 | 19.24 t | 2009 | 30.52 t |
| 1972 | 46.13 t | 1991 | 28.49 t | 2010 | 29.5 t |
| 1973 | 38.95 t | 1992 | 16.49 t | 2011 | 29.33 t |
| 1974 | 30.01 t | 1993 | 20.5 t | 2012 | 27.56 t |
| 1975 | 24.23 t | 1994 | 24.47 t | 2013 | 26.76 t |
| 1976 | 23.25 t | 1995 | 23.97 t | 2014 | 25.19 t |
| 1977 | 21.47 t | 1996 | 22.91 t | 2015 | 24.93 t |
| 1978 | 23.15 t | 1997 | 23.35 t | 2016 | 24.57 t |
| 1979 | 24.94 t | 1998 | 25.12 t | 2017 | 23.46 t |
| 1980 | 22.12 t | 1999 | 26.26 t | 2018 | 22.92 t |
| 1981 | 19.93 t | 2000 | 28.66 t | 2019 | 21.8 t |
| 1982 | 20.24 t | 2001 | 29.32 t | 2020 | 21.12 t |
| 1983 | 20.78 t | 2002 | 29.89 t | 2021 | 22.91 t |
| 1984 | 20.28 t | 2003 | 30.77 t | 2022 | 22.36 t |
| 1985 | 21.56 t | 2004 | 31.98 t | 2023 | 22.7 t |
| 1986 | 22.28 t | 2005 | 34.53 t | 2024 | 23.67 t |
| 1987 | 22.99 t | 2006 | 33.8 t | | |
| 1988 | 26.58 t | 2007 | 31.19 t | | |