| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1986/1987 | 1.579 | 吨/公顷 | 2026-9 |
| 1985/1986 | 1.493 | 吨/公顷 | 2026-9 |
| 1984/1985 | 1.345 | 吨/公顷 | 2026-9 |
| 1983/1984 | 1.52 | 吨/公顷 | 2026-9 |
| 1982/1983 | 1.363 | 吨/公顷 | 2026-9 |
| 1981/1982 | 1.151 | 吨/公顷 | 2026-9 |
| 1980/1981 | 1.068 | 吨/公顷 | 2026-9 |
| 1979/1980 | 1.132 | 吨/公顷 | 2026-9 |
| 1978/1979 | 1.595 | 吨/公顷 | 2026-9 |
| 1977/1978 | 1.146 | 吨/公顷 | 2026-9 |
| 1976/1977 | 1.401 | 吨/公顷 | 2026-9 |
| 1975/1976 | 1.024 | 吨/公顷 | 2026-9 |
| 1974/1975 | 1.404 | 吨/公顷 | 2026-9 |
| 1973/1974 | 1.389 | 吨/公顷 | 2026-9 |
| 1972/1973 | 1.068 | 吨/公顷 | 2026-9 |
| 1971/1972 | 1.217 | 吨/公顷 | 2026-9 |
| 1970/1971 | 1.172 | 吨/公顷 | 2026-9 |
| 1969/1970 | 1.072 | 吨/公顷 | 2026-9 |
| 1968/1969 | 1.042 | 吨/公顷 | 2026-9 |
| 1967/1968 | 0.946 | 吨/公顷 | 2026-9 |
| 1966/1967 | 0.876 | 吨/公顷 | 2026-9 |
| 1965/1966 | 0.916 | 吨/公顷 | 2026-9 |
| 1964/1965 | 0.733 | 吨/公顷 | 2026-9 |
| 1963/1964 | 0.716 | 吨/公顷 | 2026-9 |
| 1962/1963 | 0.91 | 吨/公顷 | 2026-9 |
| 1961/1962 | 0.901 | 吨/公顷 | 2026-9 |
| 1960/1961 | 0.911 | 吨/公顷 | 2026-9 |