Tableau de données
| 1970 | 4 595 Mt | 1989 | 5 079 Mt | 2008 | 5 689 Mt |
| 1971 | 4 460 Mt | 1990 | 4 984 Mt | 2009 | 5 273 Mt |
| 1972 | 4 711 Mt | 1991 | 4 939 Mt | 2010 | 5 521 Mt |
| 1973 | 4 897 Mt | 1992 | 5 017 Mt | 2011 | 5 308 Mt |
| 1974 | 4 727 Mt | 1993 | 5 136 Mt | 2012 | 5 088 Mt |
| 1975 | 4 515 Mt | 1994 | 5 218 Mt | 2013 | 5 225 Mt |
| 1976 | 4 816 Mt | 1995 | 5 271 Mt | 2014 | 5 244 Mt |
| 1977 | 4 980 Mt | 1996 | 5 426 Mt | 2015 | 5 133 Mt |
| 1978 | 4 970 Mt | 1997 | 5 700 Mt | 2016 | 5 029 Mt |
| 1979 | 5 007 Mt | 1998 | 5 745 Mt | 2017 | 4 959 Mt |
| 1980 | 4 780 Mt | 1999 | 5 762 Mt | 2018 | 5 118 Mt |
| 1981 | 4 709 Mt | 2000 | 5 929 Mt | 2019 | 4 968 Mt |
| 1982 | 4 465 Mt | 2001 | 5 878 Mt | 2020 | 4 467 Mt |
| 1983 | 4 449 Mt | 2002 | 5 727 Mt | 2021 | 4 754 Mt |
| 1984 | 4 655 Mt | 2003 | 5 793 Mt | 2022 | 4 816 Mt |
| 1985 | 4 681 Mt | 2004 | 5 880 Mt | 2023 | 4 618 Mt |
| 1986 | 4 643 Mt | 2005 | 5 888 Mt | 2024 | 4 632 Mt |
| 1987 | 4 801 Mt | 2006 | 5 790 Mt | | |
| 1988 | 5 021 Mt | 2007 | 5 873 Mt | | |
Tableau de données
| 1970 | 22,41 t | 1989 | 20,58 t | 2008 | 18,71 t |
| 1971 | 21,48 t | 1990 | 19,96 t | 2009 | 17,19 t |
| 1972 | 22,44 t | 1991 | 19,52 t | 2010 | 17,85 t |
| 1973 | 23,11 t | 1992 | 19,56 t | 2011 | 17,02 t |
| 1974 | 22,11 t | 1993 | 19,76 t | 2012 | 16,19 t |
| 1975 | 20,91 t | 1994 | 19,83 t | 2013 | 16,5 t |
| 1976 | 22,09 t | 1995 | 19,8 t | 2014 | 16,42 t |
| 1977 | 22,61 t | 1996 | 20,14 t | 2015 | 15,95 t |
| 1978 | 22,33 t | 1997 | 20,9 t | 2016 | 15,5 t |
| 1979 | 22,25 t | 1998 | 20,83 t | 2017 | 15,18 t |
| 1980 | 21,04 t | 1999 | 20,65 t | 2018 | 15,58 t |
| 1981 | 20,52 t | 2000 | 21,01 t | 2019 | 15,04 t |
| 1982 | 19,27 t | 2001 | 20,63 t | 2020 | 13,47 t |
| 1983 | 19,03 t | 2002 | 19,91 t | 2021 | 14,32 t |
| 1984 | 19,74 t | 2003 | 19,97 t | 2022 | 14,42 t |
| 1985 | 19,67 t | 2004 | 20,08 t | 2023 | 13,71 t |
| 1986 | 19,34 t | 2005 | 19,92 t | 2024 | 13,62 t |
| 1987 | 19,81 t | 2006 | 19,4 t | | |
| 1988 | 20,54 t | 2007 | 19,5 t | | |