| 年度 | 数值 | 单位 | 发布日期 |
|---|---|---|---|
| 1998 | 0 | 千吨 | 2026-9 |
| 1997 | 3 | 千吨 | 2026-9 |
| 1996 | 4 | 千吨 | 2026-9 |
| 1995 | 8 | 千吨 | 2026-9 |
| 1994 | 13 | 千吨 | 2026-9 |
| 1993 | 18 | 千吨 | 2026-9 |
| 1992 | 5 | 千吨 | 2026-9 |
| 1991 | 5 | 千吨 | 2026-9 |
| 1990 | 0 | 千吨 | 2026-9 |
| 1989 | 100 | 千吨 | 2026-9 |
| 1988 | 120 | 千吨 | 2026-9 |
| 1987 | 115 | 千吨 | 2026-9 |
| 1986 | 100 | 千吨 | 2026-9 |
| 1985 | 100 | 千吨 | 2026-9 |
| 1984 | 55 | 千吨 | 2026-9 |
| 1983 | 60 | 千吨 | 2026-9 |
| 1982 | 65 | 千吨 | 2026-9 |
| 1981 | 105 | 千吨 | 2026-9 |
| 1980 | 95 | 千吨 | 2026-9 |
| 1979 | 98 | 千吨 | 2026-9 |
| 1978 | 76 | 千吨 | 2026-9 |
| 1977 | 76 | 千吨 | 2026-9 |
| 1976 | 47 | 千吨 | 2026-9 |
| 1975 | 38 | 千吨 | 2026-9 |
| 1974 | 48 | 千吨 | 2026-9 |
| 1973 | 46 | 千吨 | 2026-9 |
| 1972 | 30 | 千吨 | 2026-9 |
| 1971 | 28 | 千吨 | 2026-9 |
| 1970 | 23 | 千吨 | 2026-9 |
| 1969 | 21 | 千吨 | 2026-9 |