| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1990/1991 | 3.018 | 吨/公顷 | 2026-9 |
| 1989/1990 | 3.382 | 吨/公顷 | 2026-9 |
| 1988/1989 | 3.158 | 吨/公顷 | 2026-9 |
| 1987/1988 | 2.956 | 吨/公顷 | 2026-9 |
| 1986/1987 | 3.146 | 吨/公顷 | 2026-9 |
| 1985/1986 | 3.019 | 吨/公顷 | 2026-9 |
| 1984/1985 | 2.606 | 吨/公顷 | 2026-9 |
| 1983/1984 | 2.582 | 吨/公顷 | 2026-9 |
| 1982/1983 | 2.831 | 吨/公顷 | 2026-9 |
| 1981/1982 | 2.357 | 吨/公顷 | 2026-9 |
| 1980/1981 | 2.732 | 吨/公顷 | 2026-9 |
| 1979/1980 | 2.528 | 吨/公顷 | 2026-9 |
| 1978/1979 | 2.736 | 吨/公顷 | 2026-9 |
| 1977/1978 | 2.686 | 吨/公顷 | 2026-9 |
| 1976/1977 | 2.337 | 吨/公顷 | 2026-9 |
| 1975/1976 | 2.211 | 吨/公顷 | 2026-9 |
| 1974/1975 | 2.736 | 吨/公顷 | 2026-9 |
| 1973/1974 | 2.056 | 吨/公顷 | 2026-9 |
| 1972/1973 | 2.349 | 吨/公顷 | 2026-9 |
| 1971/1972 | 2.4 | 吨/公顷 | 2026-9 |
| 1970/1971 | 2.177 | 吨/公顷 | 2026-9 |
| 1969/1970 | 2.135 | 吨/公顷 | 2026-9 |
| 1968/1969 | 2.698 | 吨/公顷 | 2026-9 |
| 1967/1968 | 2.551 | 吨/公顷 | 2026-9 |
| 1966/1967 | 2.106 | 吨/公顷 | 2026-9 |
| 1965/1966 | 2.019 | 吨/公顷 | 2026-9 |
| 1964/1965 | 2.18 | 吨/公顷 | 2026-9 |