| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1999 | 16 | 千吨 | 2026-9 |
| 1998 | 15 | 千吨 | 2026-9 |
| 1997 | 16 | 千吨 | 2026-9 |
| 1996 | 18 | 千吨 | 2026-9 |
| 1995 | 17 | 千吨 | 2026-9 |
| 1994 | 18 | 千吨 | 2026-9 |
| 1993 | 18 | 千吨 | 2026-9 |
| 1992 | 16 | 千吨 | 2026-9 |
| 1991 | 23 | 千吨 | 2026-9 |
| 1990 | 30 | 千吨 | 2026-9 |
| 1989 | 29 | 千吨 | 2026-9 |
| 1988 | 32 | 千吨 | 2026-9 |
| 1987 | 22 | 千吨 | 2026-9 |
| 1986 | 29 | 千吨 | 2026-9 |
| 1985 | 34 | 千吨 | 2026-9 |
| 1984 | 36 | 千吨 | 2026-9 |
| 1983 | 32 | 千吨 | 2026-9 |
| 1982 | 33 | 千吨 | 2026-9 |
| 1981 | 32 | 千吨 | 2026-9 |
| 1980 | 30 | 千吨 | 2026-9 |
| 1979 | 29 | 千吨 | 2026-9 |
| 1978 | 31 | 千吨 | 2026-9 |
| 1977 | 26 | 千吨 | 2026-9 |
| 1976 | 25 | 千吨 | 2026-9 |
| 1975 | 22 | 千吨 | 2026-9 |
| 1974 | 26 | 千吨 | 2026-9 |
| 1973 | 29 | 千吨 | 2026-9 |
| 1972 | 25 | 千吨 | 2026-9 |
| 1971 | 30 | 千吨 | 2026-9 |
| 1970 | 32 | 千吨 | 2026-9 |
| 1969 | 34 | 千吨 | 2026-9 |
| 1968 | 22 | 千吨 | 2026-9 |
| 1967 | 42 | 千吨 | 2026-9 |
| 1966 | 25 | 千吨 | 2026-9 |
| 1965 | 27 | 千吨 | 2026-9 |
| 1964 | 19 | 千吨 | 2026-9 |