| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1986/1987 | 0.953 | 吨/公顷 | 2026-9 |
| 1985/1986 | 0.63 | 吨/公顷 | 2026-9 |
| 1984/1985 | 0.608 | 吨/公顷 | 2026-9 |
| 1983/1984 | 0.665 | 吨/公顷 | 2026-9 |
| 1982/1983 | 0.612 | 吨/公顷 | 2026-9 |
| 1981/1982 | 0.568 | 吨/公顷 | 2026-9 |
| 1980/1981 | 0.615 | 吨/公顷 | 2026-9 |
| 1979/1980 | 0.557 | 吨/公顷 | 2026-9 |
| 1978/1979 | 0.778 | 吨/公顷 | 2026-9 |
| 1977/1978 | 0.687 | 吨/公顷 | 2026-9 |
| 1976/1977 | 0.63 | 吨/公顷 | 2026-9 |
| 1975/1976 | 0.962 | 吨/公顷 | 2026-9 |
| 1974/1975 | 0.438 | 吨/公顷 | 2026-9 |
| 1973/1974 | 0.506 | 吨/公顷 | 2026-9 |
| 1972/1973 | 0.285 | 吨/公顷 | 2026-9 |
| 1971/1972 | 0.616 | 吨/公顷 | 2026-9 |
| 1970/1971 | 0.701 | 吨/公顷 | 2026-9 |
| 1969/1970 | 0.51 | 吨/公顷 | 2026-9 |
| 1968/1969 | 0.618 | 吨/公顷 | 2026-9 |
| 1967/1968 | 0.639 | 吨/公顷 | 2026-9 |
| 1966/1967 | 0.686 | 吨/公顷 | 2026-9 |
| 1965/1966 | 0.494 | 吨/公顷 | 2026-9 |
| 1964/1965 | 0.331 | 吨/公顷 | 2026-9 |