| 时间 | 值 （万吨） | 世界排名 |
|---|---|---|
| 2016 | 10480 | |
| 2015 | 10515 | |
| 2014 | 11070 | |
| 2013 | 11060 | |
| 2012 | 10724 | |
| 2011 | 10760 | |
| 2010 | 10960 | |
| 2009 | 8753 | |
| 2008 | 11874 | |
| 2007 | 12020 | |
| 2006 | 11623 | |
| 2005 | 11247 | |
| 2004 | 11272 | |
| 2003 | 11051 | |
| 2002 | 10775 | |
| 2001 | 10287 | |
| 2000 | 10644 | |
| 1999 | 9419 | |
| 1998 | 9355 | |
| 1997 | 10455 | |
| 1996 | 9880 | |
| 1995 | 10164 | |
| 1994 | 9830 | |
| 1993 | 9962 | |
| 1992 | 9813 | |
| 1991 | 10965 | |
| 1990 | 11034 | |
| 1989 | 10791 | |
| 1988 | 10568 | |
| 1987 | 9851 | |
| 1986 | 9828 | |
| 1985 | 10528 | |
| 1984 | 10559 | |
| 1983 | 9718 | |
| 1982 | 9955 | |
| 1981 | 10168 | |
| 1980 | 11140 | |
| 1979 | 11175 | |
| 1978 | 10211 | |
| 1977 | 10241 | |
| 1976 | 10740 | |
| 1975 | 10231 | |
| 1974 | 11713 | |
| 1973 | 11932 | |
| 1972 | 9690 | |
| 1971 | 8856 | |
| 1970 | 9332 | |
| 1969 | 8217 | |
| 1968 | 6689 | |
| 1967 | 6215 | |
| 1966 | 4778 | |
| 1965 | 4116 | |
| 1964 | 3980 | |
| 1963 | 3150 | |
| 1962 | 2755 | |
| 1961 | 2827 | |
| 1960 | 2214 | |
| 1959 | 1663 | |
| 1958 | 1212 | |
| 1957 | 1257 | |
| 1956 | 1111 | |
| 1955 | 941 | |
| 1954 | 775 | |
| 1953 | 766 | |
| 1952 | 699 | |
| 1951 | 650 | |
| 1950 | 484 | |
| 1949 | 311 |