Show data table
| 1970 | 19.46 Mt | 1989 | 56.94 Mt | 2008 | 164.25 Mt |
| 1971 | 25.43 Mt | 1990 | 56.89 Mt | 2009 | 165.34 Mt |
| 1972 | 27.75 Mt | 1991 | 64.72 Mt | 2010 | 171.95 Mt |
| 1973 | 35.84 Mt | 1992 | 62.52 Mt | 2011 | 177.26 Mt |
| 1974 | 36.01 Mt | 1993 | 65.91 Mt | 2012 | 185.01 Mt |
| 1975 | 36.68 Mt | 1994 | 72.57 Mt | 2013 | 195.05 Mt |
| 1976 | 45.58 Mt | 1995 | 77.4 Mt | 2014 | 198.11 Mt |
| 1977 | 45.88 Mt | 1996 | 80.89 Mt | 2015 | 206.85 Mt |
| 1978 | 52.61 Mt | 1997 | 84.3 Mt | 2016 | 212.43 Mt |
| 1979 | 37.88 Mt | 1998 | 86.48 Mt | 2017 | 204.42 Mt |
| 1980 | 41.14 Mt | 1999 | 89.15 Mt | 2018 | 187.29 Mt |
| 1981 | 38.06 Mt | 2000 | 88.46 Mt | 2019 | 197.85 Mt |
| 1982 | 38.06 Mt | 2001 | 101.26 Mt | 2020 | 195.67 Mt |
| 1983 | 36.79 Mt | 2002 | 103.52 Mt | 2021 | 199.42 Mt |
| 1984 | 49.98 Mt | 2003 | 108.82 Mt | 2022 | 195.18 Mt |
| 1985 | 51.81 Mt | 2004 | 115.02 Mt | 2023 | 192.7 Mt |
| 1986 | 50.23 Mt | 2005 | 122.46 Mt | 2024 | 200.56 Mt |
| 1987 | 52.07 Mt | 2006 | 127.2 Mt | | |
| 1988 | 50.99 Mt | 2007 | 137.14 Mt | | |
Show data table
| 1970 | 67.93 t | 1989 | 31.81 t | 2008 | 26.06 t |
| 1971 | 75.9 t | 1990 | 29.97 t | 2009 | 24.65 t |
| 1972 | 72.07 t | 1991 | 32.25 t | 2010 | 25.03 t |
| 1973 | 82.13 t | 1992 | 29.57 t | 2011 | 24.95 t |
| 1974 | 73.63 t | 1993 | 29.66 t | 2012 | 25.03 t |
| 1975 | 67.57 t | 1994 | 31.17 t | 2013 | 25.35 t |
| 1976 | 74.01 t | 1995 | 31.79 t | 2014 | 24.58 t |
| 1977 | 64.6 t | 1996 | 31.14 t | 2015 | 24.32 t |
| 1978 | 65.01 t | 1997 | 29.92 t | 2016 | 23.77 t |
| 1979 | 41.53 t | 1998 | 28.44 t | 2017 | 22.16 t |
| 1980 | 40.5 t | 1999 | 27.3 t | 2018 | 20.04 t |
| 1981 | 34.6 t | 2000 | 25.32 t | 2019 | 20.95 t |
| 1982 | 32.64 t | 2001 | 27.19 t | 2020 | 20.81 t |
| 1983 | 29.78 t | 2002 | 26.16 t | 2021 | 20.83 t |
| 1984 | 38.27 t | 2003 | 25.96 t | 2022 | 19.37 t |
| 1985 | 37.6 t | 2004 | 25.97 t | 2023 | 18.38 t |
| 1986 | 34.23 t | 2005 | 26.25 t | 2024 | 18.26 t |
| 1987 | 33.07 t | 2006 | 25.39 t | | |
| 1988 | 30.32 t | 2007 | 24.38 t | | |