Show data table
| 1970 | 61.96 Mt | 1989 | 51.81 Mt | 2008 | 50.6 Mt |
| 1971 | 57.69 Mt | 1990 | 52.43 Mt | 2009 | 48.41 Mt |
| 1972 | 59.74 Mt | 1991 | 63.09 Mt | 2010 | 48.56 Mt |
| 1973 | 58.79 Mt | 1992 | 57.39 Mt | 2011 | 43.48 Mt |
| 1974 | 52.39 Mt | 1993 | 59.71 Mt | 2012 | 38.6 Mt |
| 1975 | 54.68 Mt | 1994 | 63.69 Mt | 2013 | 40.34 Mt |
| 1976 | 60.39 Mt | 1995 | 60.59 Mt | 2014 | 36.2 Mt |
| 1977 | 62.09 Mt | 1996 | 74.02 Mt | 2015 | 34.07 Mt |
| 1978 | 62.03 Mt | 1997 | 64.25 Mt | 2016 | 35.68 Mt |
| 1979 | 65.45 Mt | 1998 | 60.26 Mt | 2017 | 33.55 Mt |
| 1980 | 64.88 Mt | 1999 | 57.28 Mt | 2018 | 33.54 Mt |
| 1981 | 54.56 Mt | 2000 | 53.15 Mt | 2019 | 30.08 Mt |
| 1982 | 56.85 Mt | 2001 | 54.74 Mt | 2020 | 27.79 Mt |
| 1983 | 53.32 Mt | 2002 | 54.26 Mt | 2021 | 29.56 Mt |
| 1984 | 54.95 Mt | 2003 | 59.69 Mt | 2022 | 28.49 Mt |
| 1985 | 62.75 Mt | 2004 | 54.12 Mt | 2023 | 26.21 Mt |
| 1986 | 63.38 Mt | 2005 | 50.65 Mt | 2024 | 25.57 Mt |
| 1987 | 61.42 Mt | 2006 | 58.6 Mt | | |
| 1988 | 57.49 Mt | 2007 | 53.87 Mt | | |
Show data table
| 1970 | 12.57 t | 1989 | 10.09 t | 2008 | 9.21 t |
| 1971 | 11.62 t | 1990 | 10.2 t | 2009 | 8.76 t |
| 1972 | 11.97 t | 1991 | 12.24 t | 2010 | 8.75 t |
| 1973 | 11.71 t | 1992 | 11.1 t | 2011 | 7.81 t |
| 1974 | 10.38 t | 1993 | 11.51 t | 2012 | 6.9 t |
| 1975 | 10.81 t | 1994 | 12.23 t | 2013 | 7.18 t |
| 1976 | 11.9 t | 1995 | 11.58 t | 2014 | 6.41 t |
| 1977 | 12.2 t | 1996 | 14.06 t | 2015 | 5.99 t |
| 1978 | 12.15 t | 1997 | 12.16 t | 2016 | 6.23 t |
| 1979 | 12.79 t | 1998 | 11.36 t | 2017 | 5.82 t |
| 1980 | 12.66 t | 1999 | 10.76 t | 2018 | 5.79 t |
| 1981 | 10.65 t | 2000 | 9.95 t | 2019 | 5.17 t |
| 1982 | 11.11 t | 2001 | 10.22 t | 2020 | 4.77 t |
| 1983 | 10.42 t | 2002 | 10.09 t | 2021 | 5.05 t |
| 1984 | 10.75 t | 2003 | 11.07 t | 2022 | 4.83 t |
| 1985 | 12.27 t | 2004 | 10.01 t | 2023 | 4.41 t |
| 1986 | 12.38 t | 2005 | 9.35 t | 2024 | 4.28 t |
| 1987 | 11.98 t | 2006 | 10.78 t | | |
| 1988 | 11.21 t | 2007 | 9.86 t | | |