| 年度 | 数值 | 单位 | 发布日期 |
|---|---|---|---|
| 1986/1987 | 1.37 | 吨/公顷 | 2026-9 |
| 1985/1986 | 1.298 | 吨/公顷 | 2026-9 |
| 1984/1985 | 1.159 | 吨/公顷 | 2026-9 |
| 1983/1984 | 1.187 | 吨/公顷 | 2026-9 |
| 1982/1983 | 1.257 | 吨/公顷 | 2026-9 |
| 1981/1982 | 1.105 | 吨/公顷 | 2026-9 |
| 1980/1981 | 1.061 | 吨/公顷 | 2026-9 |
| 1979/1980 | 1.249 | 吨/公顷 | 2026-9 |
| 1978/1979 | 1.17 | 吨/公顷 | 2026-9 |
| 1977/1978 | 1.291 | 吨/公顷 | 2026-9 |
| 1976/1977 | 1.164 | 吨/公顷 | 2026-9 |
| 1975/1976 | 1.234 | 吨/公顷 | 2026-9 |
| 1974/1975 | 1.448 | 吨/公顷 | 2026-9 |
| 1973/1974 | 1.556 | 吨/公顷 | 2026-9 |
| 1972/1973 | 1.149 | 吨/公顷 | 2026-9 |