| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1991/1992 | 1.923 | 吨/公顷 | 2026-9 |
| 1990/1991 | 2.014 | 吨/公顷 | 2026-9 |
| 1989/1990 | 1.938 | 吨/公顷 | 2026-9 |
| 1988/1989 | 1.874 | 吨/公顷 | 2026-9 |
| 1987/1988 | 1.657 | 吨/公顷 | 2026-9 |
| 1986/1987 | 1.711 | 吨/公顷 | 2026-9 |
| 1985/1986 | 1.669 | 吨/公顷 | 2026-9 |
| 1984/1985 | 1.673 | 吨/公顷 | 2026-9 |
| 1983/1984 | 1.476 | 吨/公顷 | 2026-9 |
| 1982/1983 | 1.528 | 吨/公顷 | 2026-9 |
| 1981/1982 | 1.603 | 吨/公顷 | 2026-9 |
| 1980/1981 | 1.516 | 吨/公顷 | 2026-9 |
| 1979/1980 | 1.354 | 吨/公顷 | 2026-9 |
| 1978/1979 | 1.352 | 吨/公顷 | 2026-9 |
| 1977/1978 | 1.338 | 吨/公顷 | 2026-9 |
| 1976/1977 | 1.379 | 吨/公顷 | 2026-9 |
| 1975/1976 | 1.363 | 吨/公顷 | 2026-9 |
| 1974/1975 | 1.423 | 吨/公顷 | 2026-9 |
| 1973/1974 | 1.187 | 吨/公顷 | 2026-9 |
| 1972/1973 | 1.016 | 吨/公顷 | 2026-9 |
| 1971/1972 | 1.177 | 吨/公顷 | 2026-9 |
| 1970/1971 | 1.092 | 吨/公顷 | 2026-9 |
| 1969/1970 | 1.128 | 吨/公顷 | 2026-9 |
| 1968/1969 | 1.035 | 吨/公顷 | 2026-9 |
| 1967/1968 | 1.206 | 吨/公顷 | 2026-9 |
| 1966/1967 | 1.206 | 吨/公顷 | 2026-9 |
| 1965/1966 | 1.053 | 吨/公顷 | 2026-9 |
| 1964/1965 | 0.958 | 吨/公顷 | 2026-9 |
| 1963/1964 | 1.095 | 吨/公顷 | 2026-9 |
| 1962/1963 | 0.984 | 吨/公顷 | 2026-9 |
| 1961/1962 | 1.217 | 吨/公顷 | 2026-9 |
| 1960/1961 | 1.117 | 吨/公顷 | 2026-9 |