| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1998 | 11 | 千吨 | 2026-9 |
| 1997 | 3 | 千吨 | 2026-9 |
| 1996 | 16 | 千吨 | 2026-9 |
| 1995 | 8 | 千吨 | 2026-9 |
| 1994 | 17 | 千吨 | 2026-9 |
| 1993 | 19 | 千吨 | 2026-9 |
| 1992 | 5 | 千吨 | 2026-9 |
| 1991 | 15 | 千吨 | 2026-9 |
| 1990 | 23 | 千吨 | 2026-9 |
| 1989 | 23 | 千吨 | 2026-9 |
| 1988 | 22 | 千吨 | 2026-9 |
| 1987 | 43 | 千吨 | 2026-9 |
| 1986 | 52 | 千吨 | 2026-9 |
| 1985 | 60 | 千吨 | 2026-9 |
| 1984 | 43 | 千吨 | 2026-9 |
| 1983 | 49 | 千吨 | 2026-9 |
| 1982 | 14 | 千吨 | 2026-9 |
| 1981 | 5 | 千吨 | 2026-9 |
| 1980 | 9 | 千吨 | 2026-9 |
| 1979 | 10 | 千吨 | 2026-9 |
| 1978 | 17 | 千吨 | 2026-9 |
| 1977 | 6 | 千吨 | 2026-9 |
| 1976 | 14 | 千吨 | 2026-9 |
| 1975 | 9 | 千吨 | 2026-9 |
| 1974 | 10 | 千吨 | 2026-9 |
| 1973 | 2 | 千吨 | 2026-9 |
| 1972 | 5 | 千吨 | 2026-9 |
| 1971 | 9 | 千吨 | 2026-9 |
| 1970 | 9 | 千吨 | 2026-9 |
| 1969 | 5 | 千吨 | 2026-9 |
| 1968 | 5 | 千吨 | 2026-9 |
| 1967 | 5 | 千吨 | 2026-9 |
| 1966 | 0 | 千吨 | 2026-9 |
| 1965 | 0 | 千吨 | 2026-9 |
| 1964 | 0 | 千吨 | 2026-9 |