| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1991/1992 | 4.347 | 吨/公顷 | 2026-9 |
| 1990/1991 | 4.254 | 吨/公顷 | 2026-9 |
| 1989/1990 | 3.786 | 吨/公顷 | 2026-9 |
| 1988/1989 | 4.183 | 吨/公顷 | 2026-9 |
| 1987/1988 | 3.623 | 吨/公顷 | 2026-9 |
| 1986/1987 | 3.548 | 吨/公顷 | 2026-9 |
| 1985/1986 | 3.59 | 吨/公顷 | 2026-9 |
| 1984/1985 | 3.837 | 吨/公顷 | 2026-9 |
| 1983/1984 | 3.433 | 吨/公顷 | 2026-9 |
| 1982/1983 | 3.349 | 吨/公顷 | 2026-9 |
| 1981/1982 | 3.081 | 吨/公顷 | 2026-9 |
| 1980/1981 | 3.358 | 吨/公顷 | 2026-9 |
| 1979/1980 | 2.961 | 吨/公顷 | 2026-9 |
| 1978/1979 | 3.128 | 吨/公顷 | 2026-9 |
| 1977/1978 | 3.488 | 吨/公顷 | 2026-9 |
| 1976/1977 | 3.47 | 吨/公顷 | 2026-9 |
| 1975/1976 | 2.727 | 吨/公顷 | 2026-9 |
| 1974/1975 | 3.41 | 吨/公顷 | 2026-9 |
| 1973/1974 | 2.801 | 吨/公顷 | 2026-9 |
| 1972/1973 | 2.517 | 吨/公顷 | 2026-9 |
| 1971/1972 | 2.905 | 吨/公顷 | 2026-9 |
| 1970/1971 | 2.07 | 吨/公顷 | 2026-9 |
| 1969/1970 | 2.417 | 吨/公顷 | 2026-9 |
| 1968/1969 | 2.169 | 吨/公顷 | 2026-9 |
| 1967/1968 | 2.564 | 吨/公顷 | 2026-9 |
| 1966/1967 | 2.514 | 吨/公顷 | 2026-9 |
| 1965/1966 | 2.06 | 吨/公顷 | 2026-9 |
| 1964/1965 | 1.762 | 吨/公顷 | 2026-9 |
| 1963/1964 | 1.935 | 吨/公顷 | 2026-9 |
| 1962/1963 | 1.648 | 吨/公顷 | 2026-9 |
| 1961/1962 | 1.617 | 吨/公顷 | 2026-9 |
| 1960/1961 | 1.733 | 吨/公顷 | 2026-9 |