| 时间 | 值 （万吨） | 世界排名 |
|---|---|---|
| 2016 | 9560 | |
| 2015 | 8960 | |
| 2014 | 8320 | |
| 2013 | 8120 | |
| 2012 | 7672 | |
| 2011 | 7220 | |
| 2010 | 6685 | |
| 2009 | 6284 | |
| 2008 | 5779 | |
| 2007 | 5347 | |
| 2006 | 4945 | |
| 2005 | 4578 | |
| 2004 | 3263 | |
| 2003 | 3178 | |
| 2002 | 2881 | |
| 2001 | 2729 | |
| 2000 | 2692 | |
| 1999 | 2430 | |
| 1998 | 2348 | |
| 1997 | 2442 | |
| 1996 | 2375 | |
| 1995 | 2200 | |
| 1994 | 1928 | |
| 1993 | 1816 | |
| 1992 | 1812 | |
| 1991 | 1710 | |
| 1990 | 1496 | |
| 1989 | 1443 | |
| 1988 | 1431 | |
| 1987 | 1312 | |
| 1986 | 1220 | |
| 1985 | 1194 | |
| 1984 | 1055 | |
| 1983 | 1024 | |
| 1982 | 1100 | |
| 1981 | 1077 | |
| 1980 | 951 | |
| 1979 | 950 | |
| 1978 | 995 | |
| 1977 | 984 | |
| 1976 | 931 | |
| 1975 | 788 | |
| 1974 | 674 | |
| 1973 | 735 | |
| 1972 | 691 | |
| 1971 | 638 | |
| 1970 | 629 | |
| 1969 | 651 | |
| 1968 | 650 | |
| 1967 | 644 | |
| 1966 | 661 | |
| 1965 | 641 | |
| 1964 | 603 | |
| 1963 | 589 | |
| 1962 | 515 | |
| 1961 | 408 | |
| 1960 | 329 | |
| 1959 | 247 | |
| 1958 | 184 | |
| 1957 | 174 | |
| 1956 | 177 | |
| 1955 | 173 | |
| 1954 | 171 | |
| 1953 | 153 | |
| 1952 | 160 | |
| 1951 | 152 | |
| 1950 | 146 | |
| 1949 | 137 |