| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1986/1987 | 1.448 | 吨/公顷 | 2026-9 |
| 1985/1986 | 1.415 | 吨/公顷 | 2026-9 |
| 1984/1985 | 1.304 | 吨/公顷 | 2026-9 |
| 1983/1984 | 1.319 | 吨/公顷 | 2026-9 |
| 1982/1983 | 1.272 | 吨/公顷 | 2026-9 |
| 1981/1982 | 0.865 | 吨/公顷 | 2026-9 |
| 1980/1981 | 1.149 | 吨/公顷 | 2026-9 |
| 1979/1980 | 1.081 | 吨/公顷 | 2026-9 |
| 1978/1979 | 1.338 | 吨/公顷 | 2026-9 |
| 1977/1978 | 1.229 | 吨/公顷 | 2026-9 |
| 1976/1977 | 1.398 | 吨/公顷 | 2026-9 |
| 1975/1976 | 0.898 | 吨/公顷 | 2026-9 |
| 1974/1975 | 1.151 | 吨/公顷 | 2026-9 |
| 1973/1974 | 1.282 | 吨/公顷 | 2026-9 |
| 1972/1973 | 1.08 | 吨/公顷 | 2026-9 |
| 1971/1972 | 1.323 | 吨/公顷 | 2026-9 |
| 1970/1971 | 1.336 | 吨/公顷 | 2026-9 |
| 1969/1970 | 1.223 | 吨/公顷 | 2026-9 |
| 1968/1969 | 1.125 | 吨/公顷 | 2026-9 |
| 1967/1968 | 1.16 | 吨/公顷 | 2026-9 |
| 1966/1967 | 1.117 | 吨/公顷 | 2026-9 |
| 1965/1966 | 0.812 | 吨/公顷 | 2026-9 |
| 1964/1965 | 0.838 | 吨/公顷 | 2026-9 |
| 1963/1964 | 0.603 | 吨/公顷 | 2026-9 |
| 1962/1963 | 0.712 | 吨/公顷 | 2026-9 |
| 1961/1962 | 0.671 | 吨/公顷 | 2026-9 |
| 1960/1961 | 0.813 | 吨/公顷 | 2026-9 |