| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1990/1991 | 1 | 吨/公顷 | 2026-9 |
| 1989/1990 | 0.958 | 吨/公顷 | 2026-9 |
| 1988/1989 | 1 | 吨/公顷 | 2026-9 |
| 1987/1988 | 1.095 | 吨/公顷 | 2026-9 |
| 1986/1987 | 1.048 | 吨/公顷 | 2026-9 |
| 1985/1986 | 1.05 | 吨/公顷 | 2026-9 |
| 1984/1985 | 0.833 | 吨/公顷 | 2026-9 |
| 1983/1984 | 0.67 | 吨/公顷 | 2026-9 |
| 1982/1983 | 0.87 | 吨/公顷 | 2026-9 |
| 1981/1982 | 0.87 | 吨/公顷 | 2026-9 |
| 1980/1981 | 0.875 | 吨/公顷 | 2026-9 |
| 1979/1980 | 0.939 | 吨/公顷 | 2026-9 |
| 1978/1979 | 0.612 | 吨/公顷 | 2026-9 |
| 1977/1978 | 0.84 | 吨/公顷 | 2026-9 |
| 1976/1977 | 0.75 | 吨/公顷 | 2026-9 |
| 1975/1976 | 0.805 | 吨/公顷 | 2026-9 |
| 1974/1975 | 0.818 | 吨/公顷 | 2026-9 |
| 1973/1974 | 0.818 | 吨/公顷 | 2026-9 |
| 1972/1973 | 0 | 吨/公顷 | 2026-9 |
| 1971/1972 | 0.8 | 吨/公顷 | 2026-9 |
| 1970/1971 | 0.769 | 吨/公顷 | 2026-9 |
| 1969/1970 | 0.769 | 吨/公顷 | 2026-9 |
| 1968/1969 | 0.771 | 吨/公顷 | 2026-9 |
| 1967/1968 | 0.77 | 吨/公顷 | 2026-9 |
| 1966/1967 | 0.778 | 吨/公顷 | 2026-9 |
| 1965/1966 | 0.781 | 吨/公顷 | 2026-9 |
| 1964/1965 | 0.7 | 吨/公顷 | 2026-9 |
| 1963/1964 | 0.7 | 吨/公顷 | 2026-9 |
| 1962/1963 | 0.7 | 吨/公顷 | 2026-9 |
| 1961/1962 | 0.7 | 吨/公顷 | 2026-9 |