Show data table
| 1970 | 15,751 Mt | 1989 | 22,343 Mt | 2008 | 32,414 Mt |
| 1971 | 15,683 Mt | 1990 | 22,660 Mt | 2009 | 31,967 Mt |
| 1972 | 16,479 Mt | 1991 | 22,795 Mt | 2010 | 33,969 Mt |
| 1973 | 17,461 Mt | 1992 | 22,715 Mt | 2011 | 35,037 Mt |
| 1974 | 17,398 Mt | 1993 | 22,808 Mt | 2012 | 35,490 Mt |
| 1975 | 17,328 Mt | 1994 | 23,039 Mt | 2013 | 36,177 Mt |
| 1976 | 18,315 Mt | 1995 | 23,682 Mt | 2014 | 36,397 Mt |
| 1977 | 18,870 Mt | 1996 | 24,149 Mt | 2015 | 36,293 Mt |
| 1978 | 19,480 Mt | 1997 | 24,599 Mt | 2016 | 36,391 Mt |
| 1979 | 20,019 Mt | 1998 | 24,757 Mt | 2017 | 37,020 Mt |
| 1980 | 19,773 Mt | 1999 | 24,940 Mt | 2018 | 37,906 Mt |
| 1981 | 19,402 Mt | 2000 | 25,695 Mt | 2019 | 38,008 Mt |
| 1982 | 19,157 Mt | 2001 | 26,001 Mt | 2020 | 36,210 Mt |
| 1983 | 19,303 Mt | 2002 | 26,415 Mt | 2021 | 38,220 Mt |
| 1984 | 19,922 Mt | 2003 | 27,642 Mt | 2022 | 38,548 Mt |
| 1985 | 20,182 Mt | 2004 | 28,926 Mt | 2023 | 39,113 Mt |
| 1986 | 20,540 Mt | 2005 | 30,016 Mt | 2024 | 39,633 Mt |
| 1987 | 21,199 Mt | 2006 | 31,038 Mt | | |
| 1988 | 21,958 Mt | 2007 | 32,207 Mt | | |
Show data table
| 1970 | 4.14 t | 1989 | 4.16 t | 2008 | 4.56 t |
| 1971 | 4.04 t | 1990 | 4.15 t | 2009 | 4.45 t |
| 1972 | 4.16 t | 1991 | 4.1 t | 2010 | 4.67 t |
| 1973 | 4.32 t | 1992 | 4.01 t | 2011 | 4.76 t |
| 1974 | 4.23 t | 1993 | 3.97 t | 2012 | 4.77 t |
| 1975 | 4.14 t | 1994 | 3.94 t | 2013 | 4.81 t |
| 1976 | 4.31 t | 1995 | 3.99 t | 2014 | 4.78 t |
| 1977 | 4.36 t | 1996 | 4.01 t | 2015 | 4.7 t |
| 1978 | 4.42 t | 1997 | 4.02 t | 2016 | 4.65 t |
| 1979 | 4.46 t | 1998 | 3.98 t | 2017 | 4.67 t |
| 1980 | 4.33 t | 1999 | 3.95 t | 2018 | 4.73 t |
| 1981 | 4.18 t | 2000 | 4.01 t | 2019 | 4.7 t |
| 1982 | 4.05 t | 2001 | 4.01 t | 2020 | 4.47 t |
| 1983 | 4.01 t | 2002 | 4.01 t | 2021 | 4.68 t |
| 1984 | 4.07 t | 2003 | 4.15 t | 2022 | 4.67 t |
| 1985 | 4.05 t | 2004 | 4.28 t | 2023 | 4.68 t |
| 1986 | 4.04 t | 2005 | 4.39 t | 2024 | 4.69 t |
| 1987 | 4.1 t | 2006 | 4.48 t | | |
| 1988 | 4.16 t | 2007 | 4.59 t | | |