Show data table
| 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 | | |
Show data table
| 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 | | |