| 年度 | 数值 | 单位 | 发布日期 |
|---|---|---|---|
| 1975/1976 | 0.5 | 吨/公顷 | 2026-9 |
| 1974/1975 | 0.5 | 吨/公顷 | 2026-9 |
| 1973/1974 | 0.5 | 吨/公顷 | 2026-9 |
| 1972/1973 | 0.5 | 吨/公顷 | 2026-9 |
| 1971/1972 | 0.4 | 吨/公顷 | 2026-9 |
| 1970/1971 | 0.4 | 吨/公顷 | 2026-9 |
| 1969/1970 | 0.5 | 吨/公顷 | 2026-9 |
| 1968/1969 | 0.5 | 吨/公顷 | 2026-9 |
| 1967/1968 | 0.5 | 吨/公顷 | 2026-9 |
| 1966/1967 | 0.5 | 吨/公顷 | 2026-9 |
| 1965/1966 | 0.5 | 吨/公顷 | 2026-9 |
| 1964/1965 | 0.333 | 吨/公顷 | 2026-9 |
| 1963/1964 | 0.5 | 吨/公顷 | 2026-9 |
| 1962/1963 | 0.4 | 吨/公顷 | 2026-9 |
| 1961/1962 | 0.5 | 吨/公顷 | 2026-9 |
| 1960/1961 | 0.5 | 吨/公顷 | 2026-9 |