| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1986/1987 | 3.808 | 吨/公顷 | 2026-9 |
| 1985/1986 | 3.44 | 吨/公顷 | 2026-9 |
| 1984/1985 | 3.551 | 吨/公顷 | 2026-9 |
| 1983/1984 | 3.336 | 吨/公顷 | 2026-9 |
| 1982/1983 | 3.423 | 吨/公顷 | 2026-9 |
| 1981/1982 | 3.525 | 吨/公顷 | 2026-9 |
| 1980/1981 | 3.763 | 吨/公顷 | 2026-9 |
| 1979/1980 | 3.518 | 吨/公顷 | 2026-9 |
| 1978/1979 | 3.267 | 吨/公顷 | 2026-9 |
| 1977/1978 | 3.633 | 吨/公顷 | 2026-9 |
| 1976/1977 | 3.443 | 吨/公顷 | 2026-9 |
| 1975/1976 | 3.61 | 吨/公顷 | 2026-9 |
| 1974/1975 | 3.471 | 吨/公顷 | 2026-9 |
| 1973/1974 | 3.431 | 吨/公顷 | 2026-9 |
| 1972/1973 | 3.511 | 吨/公顷 | 2026-9 |
| 1971/1972 | 3.29 | 吨/公顷 | 2026-9 |
| 1970/1971 | 3.283 | 吨/公顷 | 2026-9 |
| 1969/1970 | 3.031 | 吨/公顷 | 2026-9 |
| 1968/1969 | 3.058 | 吨/公顷 | 2026-9 |
| 1967/1968 | 2.858 | 吨/公顷 | 2026-9 |
| 1966/1967 | 2.581 | 吨/公顷 | 2026-9 |
| 1965/1966 | 2 | 吨/公顷 | 2026-9 |
| 1964/1965 | 2.215 | 吨/公顷 | 2026-9 |
| 1963/1964 | 2.293 | 吨/公顷 | 2026-9 |
| 1962/1963 | 2.059 | 吨/公顷 | 2026-9 |
| 1961/1962 | 1.881 | 吨/公顷 | 2026-9 |
| 1960/1961 | 1.568 | 吨/公顷 | 2026-9 |