| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1991/1992 | 5.145 | 吨/公顷 | 2026-9 |
| 1990/1991 | 5.422 | 吨/公顷 | 2026-9 |
| 1989/1990 | 5.13 | 吨/公顷 | 2026-9 |
| 1988/1989 | 5.284 | 吨/公顷 | 2026-9 |
| 1987/1988 | 5.078 | 吨/公顷 | 2026-9 |
| 1986/1987 | 4.403 | 吨/公顷 | 2026-9 |
| 1985/1986 | 4.982 | 吨/公顷 | 2026-9 |
| 1984/1985 | 5.137 | 吨/公顷 | 2026-9 |
| 1983/1984 | 4.891 | 吨/公顷 | 2026-9 |
| 1982/1983 | 4.313 | 吨/公顷 | 2026-9 |
| 1981/1982 | 3.994 | 吨/公顷 | 2026-9 |
| 1980/1981 | 4.53 | 吨/公顷 | 2026-9 |
| 1979/1980 | 3.363 | 吨/公顷 | 2026-9 |
| 1978/1979 | 4.396 | 吨/公顷 | 2026-9 |
| 1977/1978 | 4.051 | 吨/公顷 | 2026-9 |
| 1976/1977 | 3.761 | 吨/公顷 | 2026-9 |
| 1975/1976 | 3.552 | 吨/公顷 | 2026-9 |
| 1974/1975 | 3.965 | 吨/公顷 | 2026-9 |
| 1973/1974 | 3.762 | 吨/公顷 | 2026-9 |
| 1972/1973 | 3.356 | 吨/公顷 | 2026-9 |
| 1971/1972 | 3.516 | 吨/公顷 | 2026-9 |
| 1970/1971 | 2.936 | 吨/公顷 | 2026-9 |
| 1969/1970 | 3.09 | 吨/公顷 | 2026-9 |
| 1968/1969 | 3.156 | 吨/公顷 | 2026-9 |
| 1967/1968 | 2.708 | 吨/公顷 | 2026-9 |
| 1966/1967 | 2.519 | 吨/公顷 | 2026-9 |
| 1965/1966 | 2.412 | 吨/公顷 | 2026-9 |
| 1964/1965 | 2.201 | 吨/公顷 | 2026-9 |
| 1963/1964 | 2.453 | 吨/公顷 | 2026-9 |
| 1962/1963 | 2.443 | 吨/公顷 | 2026-9 |
| 1961/1962 | 2.591 | 吨/公顷 | 2026-9 |
| 1960/1961 | 2.305 | 吨/公顷 | 2026-9 |