| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1990/1991 | 2.937 | 吨/公顷 | 2026-9 |
| 1989/1990 | 2.836 | 吨/公顷 | 2026-9 |
| 1988/1989 | 2.533 | 吨/公顷 | 2026-9 |
| 1987/1988 | 2.224 | 吨/公顷 | 2026-9 |
| 1986/1987 | 2.723 | 吨/公顷 | 2026-9 |
| 1985/1986 | 2.507 | 吨/公顷 | 2026-9 |
| 1984/1985 | 2.482 | 吨/公顷 | 2026-9 |
| 1983/1984 | 1.907 | 吨/公顷 | 2026-9 |
| 1982/1983 | 2.204 | 吨/公顷 | 2026-9 |
| 1981/1982 | 2.197 | 吨/公顷 | 2026-9 |
| 1980/1981 | 2.185 | 吨/公顷 | 2026-9 |
| 1979/1980 | 2.308 | 吨/公顷 | 2026-9 |
| 1978/1979 | 1.936 | 吨/公顷 | 2026-9 |
| 1977/1978 | 1.974 | 吨/公顷 | 2026-9 |
| 1976/1977 | 1.841 | 吨/公顷 | 2026-9 |
| 1975/1976 | 1.819 | 吨/公顷 | 2026-9 |
| 1974/1975 | 2.333 | 吨/公顷 | 2026-9 |
| 1973/1974 | 2 | 吨/公顷 | 2026-9 |
| 1972/1973 | 1.452 | 吨/公顷 | 2026-9 |
| 1971/1972 | 2 | 吨/公顷 | 2026-9 |
| 1970/1971 | 2.077 | 吨/公顷 | 2026-9 |
| 1969/1970 | 2.083 | 吨/公顷 | 2026-9 |
| 1968/1969 | 2 | 吨/公顷 | 2026-9 |
| 1967/1968 | 1.95 | 吨/公顷 | 2026-9 |
| 1966/1967 | 1.571 | 吨/公顷 | 2026-9 |
| 1965/1966 | 1.852 | 吨/公顷 | 2026-9 |
| 1964/1965 | 2.08 | 吨/公顷 | 2026-9 |