Show data table
| 1970 | 0.0659 Mt | 1989 | 0.1532 Mt | 2008 | 0.3284 Mt |
| 1971 | 0.0659 Mt | 1990 | 0.1586 Mt | 2009 | 0.3279 Mt |
| 1972 | 0.0703 Mt | 1991 | 0.1645 Mt | 2010 | 0.3585 Mt |
| 1973 | 0.0845 Mt | 1992 | 0.1806 Mt | 2011 | 0.3728 Mt |
| 1974 | 0.1037 Mt | 1993 | 0.1826 Mt | 2012 | 0.3719 Mt |
| 1975 | 0.0857 Mt | 1994 | 0.1877 Mt | 2013 | 0.3931 Mt |
| 1976 | 0.0844 Mt | 1995 | 0.1703 Mt | 2014 | 0.3745 Mt |
| 1977 | 0.0892 Mt | 1996 | 0.1718 Mt | 2015 | 0.3336 Mt |
| 1978 | 0.0885 Mt | 1997 | 0.1771 Mt | 2016 | 0.3236 Mt |
| 1979 | 0.0951 Mt | 1998 | 0.1822 Mt | 2017 | 0.2919 Mt |
| 1980 | 0.1024 Mt | 1999 | 0.1819 Mt | 2018 | 0.3252 Mt |
| 1981 | 0.1445 Mt | 2000 | 0.2328 Mt | 2019 | 0.3193 Mt |
| 1982 | 0.1282 Mt | 2001 | 0.2555 Mt | 2020 | 0.3077 Mt |
| 1983 | 0.1407 Mt | 2002 | 0.2678 Mt | 2021 | 0.3326 Mt |
| 1984 | 0.1255 Mt | 2003 | 0.278 Mt | 2022 | 0.299 Mt |
| 1985 | 0.1247 Mt | 2004 | 0.2865 Mt | 2023 | 0.2998 Mt |
| 1986 | 0.0983 Mt | 2005 | 0.2989 Mt | 2024 | 0.3145 Mt |
| 1987 | 0.1304 Mt | 2006 | 0.2998 Mt | | |
| 1988 | 0.159 Mt | 2007 | 0.3237 Mt | | |
Show data table
| 1970 | 0.37 t | 1989 | 0.48 t | 2008 | 0.65 t |
| 1971 | 0.36 t | 1990 | 0.48 t | 2009 | 0.63 t |
| 1972 | 0.38 t | 1991 | 0.48 t | 2010 | 0.67 t |
| 1973 | 0.45 t | 1992 | 0.51 t | 2011 | 0.67 t |
| 1974 | 0.53 t | 1993 | 0.5 t | 2012 | 0.65 t |
| 1975 | 0.43 t | 1994 | 0.5 t | 2013 | 0.66 t |
| 1976 | 0.41 t | 1995 | 0.44 t | 2014 | 0.61 t |
| 1977 | 0.42 t | 1996 | 0.43 t | 2015 | 0.52 t |
| 1978 | 0.4 t | 1997 | 0.43 t | 2016 | 0.49 t |
| 1979 | 0.41 t | 1998 | 0.43 t | 2017 | 0.43 t |
| 1980 | 0.43 t | 1999 | 0.42 t | 2018 | 0.46 t |
| 1981 | 0.59 t | 2000 | 0.53 t | 2019 | 0.44 t |
| 1982 | 0.5 t | 2001 | 0.57 t | 2020 | 0.41 t |
| 1983 | 0.53 t | 2002 | 0.59 t | 2021 | 0.44 t |
| 1984 | 0.46 t | 2003 | 0.6 t | 2022 | 0.38 t |
| 1985 | 0.44 t | 2004 | 0.6 t | 2023 | 0.37 t |
| 1986 | 0.34 t | 2005 | 0.62 t | 2024 | 0.38 t |
| 1987 | 0.43 t | 2006 | 0.61 t | | |
| 1988 | 0.51 t | 2007 | 0.65 t | | |