Show data table
| 1970 | 0.0442 Mt | 1989 | 0.181 Mt | 2008 | 0.2916 Mt |
| 1971 | 0.0442 Mt | 1990 | 0.169 Mt | 2009 | 0.3091 Mt |
| 1972 | 0.044 Mt | 1991 | 0.2127 Mt | 2010 | 0.3138 Mt |
| 1973 | 0.0455 Mt | 1992 | 0.1901 Mt | 2011 | 0.3184 Mt |
| 1974 | 0.0491 Mt | 1993 | 0.2042 Mt | 2012 | 0.3202 Mt |
| 1975 | 0.051 Mt | 1994 | 0.2035 Mt | 2013 | 0.3295 Mt |
| 1976 | 0.0528 Mt | 1995 | 0.2092 Mt | 2014 | 0.3412 Mt |
| 1977 | 0.0547 Mt | 1996 | 0.2066 Mt | 2015 | 0.3625 Mt |
| 1978 | 0.0555 Mt | 1997 | 0.2152 Mt | 2016 | 0.3788 Mt |
| 1979 | 0.0639 Mt | 1998 | 0.2202 Mt | 2017 | 0.3066 Mt |
| 1980 | 0.0628 Mt | 1999 | 0.2297 Mt | 2018 | 0.3526 Mt |
| 1981 | 0.0602 Mt | 2000 | 0.2011 Mt | 2019 | 0.3566 Mt |
| 1982 | 0.056 Mt | 2001 | 0.2115 Mt | 2020 | 0.3363 Mt |
| 1983 | 0.0612 Mt | 2002 | 0.2233 Mt | 2021 | 0.336 Mt |
| 1984 | 0.0783 Mt | 2003 | 0.2645 Mt | 2022 | 0.3439 Mt |
| 1985 | 0.0876 Mt | 2004 | 0.2697 Mt | 2023 | 0.3293 Mt |
| 1986 | 0.0785 Mt | 2005 | 0.2753 Mt | 2024 | 0.3422 Mt |
| 1987 | 0.1829 Mt | 2006 | 0.2891 Mt | | |
| 1988 | 0.1935 Mt | 2007 | 0.3073 Mt | | |
Show data table
| 1970 | 0.08 t | 1989 | 0.19 t | 2008 | 0.2 t |
| 1971 | 0.08 t | 1990 | 0.17 t | 2009 | 0.2 t |
| 1972 | 0.08 t | 1991 | 0.21 t | 2010 | 0.2 t |
| 1973 | 0.08 t | 1992 | 0.19 t | 2011 | 0.2 t |
| 1974 | 0.08 t | 1993 | 0.19 t | 2012 | 0.19 t |
| 1975 | 0.08 t | 1994 | 0.19 t | 2013 | 0.19 t |
| 1976 | 0.08 t | 1995 | 0.19 t | 2014 | 0.2 t |
| 1977 | 0.07 t | 1996 | 0.18 t | 2015 | 0.2 t |
| 1978 | 0.07 t | 1997 | 0.18 t | 2016 | 0.21 t |
| 1979 | 0.08 t | 1998 | 0.19 t | 2017 | 0.16 t |
| 1980 | 0.08 t | 1999 | 0.19 t | 2018 | 0.18 t |
| 1981 | 0.07 t | 2000 | 0.16 t | 2019 | 0.18 t |
| 1982 | 0.07 t | 2001 | 0.17 t | 2020 | 0.17 t |
| 1983 | 0.07 t | 2002 | 0.17 t | 2021 | 0.16 t |
| 1984 | 0.09 t | 2003 | 0.2 t | 2022 | 0.16 t |
| 1985 | 0.1 t | 2004 | 0.2 t | 2023 | 0.15 t |
| 1986 | 0.09 t | 2005 | 0.2 t | 2024 | 0.16 t |
| 1987 | 0.2 t | 2006 | 0.2 t | | |
| 1988 | 0.21 t | 2007 | 0.21 t | | |