Mostrar tabla de datos
| 1970 | 29,45 Mt | 1989 | 23,41 Mt | 2008 | 15,4 Mt |
| 1971 | 31,75 Mt | 1990 | 19,02 Mt | 2009 | 13,97 Mt |
| 1972 | 38,87 Mt | 1991 | 19,53 Mt | 2010 | 13,43 Mt |
| 1973 | 43,11 Mt | 1992 | 20,26 Mt | 2011 | 11,67 Mt |
| 1974 | 40,87 Mt | 1993 | 20,77 Mt | 2012 | 11,34 Mt |
| 1975 | 38,03 Mt | 1994 | 21,41 Mt | 2013 | 10,94 Mt |
| 1976 | 41,69 Mt | 1995 | 21,87 Mt | 2014 | 11,51 Mt |
| 1977 | 46,85 Mt | 1996 | 22,18 Mt | 2015 | 12,1 Mt |
| 1978 | 47,44 Mt | 1997 | 22,8 Mt | 2016 | 11,35 Mt |
| 1979 | 40,43 Mt | 1998 | 23,19 Mt | 2017 | 11,63 Mt |
| 1980 | 33,18 Mt | 1999 | 25,15 Mt | 2018 | 13,72 Mt |
| 1981 | 28,45 Mt | 2000 | 25,18 Mt | 2019 | 12,63 Mt |
| 1982 | 21,61 Mt | 2001 | 24,86 Mt | 2020 | 12,47 Mt |
| 1983 | 22 Mt | 2002 | 20,14 Mt | 2021 | 12,67 Mt |
| 1984 | 19,74 Mt | 2003 | 26,13 Mt | 2022 | 13,92 Mt |
| 1985 | 17,26 Mt | 2004 | 26,18 Mt | 2023 | 14,63 Mt |
| 1986 | 21,41 Mt | 2005 | 26,31 Mt | 2024 | 15,43 Mt |
| 1987 | 19,14 Mt | 2006 | 16,97 Mt | | |
| 1988 | 22,34 Mt | 2007 | 17,96 Mt | | |
Mostrar tabla de datos
| 1970 | 10,83 t | 1989 | 6,68 t | 2008 | 4,09 t |
| 1971 | 11,49 t | 1990 | 5,38 t | 2009 | 3,74 t |
| 1972 | 13,8 t | 1991 | 5,48 t | 2010 | 3,61 t |
| 1973 | 14,97 t | 1992 | 5,65 t | 2011 | 3,16 t |
| 1974 | 13,91 t | 1993 | 5,74 t | 2012 | 3,1 t |
| 1975 | 12,7 t | 1994 | 5,87 t | 2013 | 3,01 t |
| 1976 | 13,7 t | 1995 | 5,94 t | 2014 | 3,21 t |
| 1977 | 15,17 t | 1996 | 5,95 t | 2015 | 3,42 t |
| 1978 | 15,16 t | 1997 | 6,06 t | 2016 | 3,26 t |
| 1979 | 12,76 t | 1998 | 6,13 t | 2017 | 3,41 t |
| 1980 | 10,35 t | 1999 | 6,62 t | 2018 | 4,17 t |
| 1981 | 8,77 t | 2000 | 6,61 t | 2019 | 3,82 t |
| 1982 | 6,59 t | 2001 | 6,51 t | 2020 | 3,8 t |
| 1983 | 6,64 t | 2002 | 5,27 t | 2021 | 3,88 t |
| 1984 | 5,9 t | 2003 | 6,83 t | 2022 | 4,32 t |
| 1985 | 5,11 t | 2004 | 6,84 t | 2023 | 4,57 t |
| 1986 | 6,28 t | 2005 | 6,89 t | 2024 | 4,82 t |
| 1987 | 5,56 t | 2006 | 4,46 t | | |
| 1988 | 6,43 t | 2007 | 4,75 t | | |