| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1991/1992 | 2.029 | 吨/公顷 | 2026-9 |
| 1990/1991 | 1.895 | 吨/公顷 | 2026-9 |
| 1989/1990 | 2.027 | 吨/公顷 | 2026-9 |
| 1988/1989 | 1.9 | 吨/公顷 | 2026-9 |
| 1987/1988 | 1.683 | 吨/公顷 | 2026-9 |
| 1986/1987 | 1.762 | 吨/公顷 | 2026-9 |
| 1985/1986 | 1.75 | 吨/公顷 | 2026-9 |
| 1984/1985 | 1.723 | 吨/公顷 | 2026-9 |
| 1983/1984 | 1.628 | 吨/公顷 | 2026-9 |
| 1982/1983 | 1.585 | 吨/公顷 | 2026-9 |
| 1981/1982 | 1.389 | 吨/公顷 | 2026-9 |
| 1980/1981 | 1.436 | 吨/公顷 | 2026-9 |
| 1979/1980 | 1.373 | 吨/公顷 | 2026-9 |
| 1978/1979 | 1.286 | 吨/公顷 | 2026-9 |
| 1977/1978 | 1.261 | 吨/公顷 | 2026-9 |
| 1976/1977 | 1.382 | 吨/公顷 | 2026-9 |
| 1975/1976 | 1.167 | 吨/公顷 | 2026-9 |
| 1974/1975 | 1.308 | 吨/公顷 | 2026-9 |
| 1973/1974 | 1.229 | 吨/公顷 | 2026-9 |
| 1972/1973 | 1.154 | 吨/公顷 | 2026-9 |
| 1971/1972 | 1.218 | 吨/公顷 | 2026-9 |
| 1970/1971 | 1.134 | 吨/公顷 | 2026-9 |
| 1969/1970 | 1.089 | 吨/公顷 | 2026-9 |
| 1968/1969 | 1.046 | 吨/公顷 | 2026-9 |
| 1967/1968 | 1.239 | 吨/公顷 | 2026-9 |
| 1966/1967 | 1.248 | 吨/公顷 | 2026-9 |
| 1965/1966 | 1.069 | 吨/公顷 | 2026-9 |
| 1964/1965 | 1.115 | 吨/公顷 | 2026-9 |
| 1963/1964 | 0.994 | 吨/公顷 | 2026-9 |
| 1962/1963 | 0.955 | 吨/公顷 | 2026-9 |
| 1961/1962 | 1.061 | 吨/公顷 | 2026-9 |
| 1960/1961 | 1.094 | 吨/公顷 | 2026-9 |