| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1991/1992 | 3.811 | 吨/公顷 | 2026-9 |
| 1990/1991 | 4.304 | 吨/公顷 | 2026-9 |
| 1989/1990 | 4.046 | 吨/公顷 | 2026-9 |
| 1988/1989 | 3.734 | 吨/公顷 | 2026-9 |
| 1987/1988 | 3.493 | 吨/公顷 | 2026-9 |
| 1986/1987 | 3.529 | 吨/公顷 | 2026-9 |
| 1985/1986 | 3.464 | 吨/公顷 | 2026-9 |
| 1984/1985 | 3.698 | 吨/公顷 | 2026-9 |
| 1983/1984 | 3.7 | 吨/公顷 | 2026-9 |
| 1982/1983 | 3.313 | 吨/公顷 | 2026-9 |
| 1981/1982 | 3.181 | 吨/公顷 | 2026-9 |
| 1980/1981 | 3.22 | 吨/公顷 | 2026-9 |
| 1979/1980 | 2.928 | 吨/公顷 | 2026-9 |
| 1978/1979 | 3.369 | 吨/公顷 | 2026-9 |
| 1977/1978 | 3.024 | 吨/公顷 | 2026-9 |
| 1976/1977 | 2.671 | 吨/公顷 | 2026-9 |
| 1975/1976 | 2.775 | 吨/公顷 | 2026-9 |
| 1974/1975 | 3.078 | 吨/公顷 | 2026-9 |
| 1973/1974 | 3.067 | 吨/公顷 | 2026-9 |
| 1972/1973 | 2.733 | 吨/公顷 | 2026-9 |
| 1971/1972 | 2.645 | 吨/公顷 | 2026-9 |
| 1970/1971 | 2.073 | 吨/公顷 | 2026-9 |
| 1969/1970 | 2.498 | 吨/公顷 | 2026-9 |
| 1968/1969 | 2.275 | 吨/公顷 | 2026-9 |
| 1967/1968 | 2.146 | 吨/公顷 | 2026-9 |
| 1966/1967 | 2 | 吨/公顷 | 2026-9 |
| 1965/1966 | 2.005 | 吨/公顷 | 2026-9 |
| 1964/1965 | 2.143 | 吨/公顷 | 2026-9 |
| 1963/1964 | 2.066 | 吨/公顷 | 2026-9 |
| 1962/1963 | 2.077 | 吨/公顷 | 2026-9 |
| 1961/1962 | 2.147 | 吨/公顷 | 2026-9 |
| 1960/1961 | 2.077 | 吨/公顷 | 2026-9 |