| 年度 | 数值 | 单位 | 发布日期 |
|---|---|---|---|
| 1990/1991 | 1.082 | 吨/公顷 | 2026-9 |
| 1989/1990 | 0.951 | 吨/公顷 | 2026-9 |
| 1988/1989 | 1.219 | 吨/公顷 | 2026-9 |
| 1987/1988 | 1.012 | 吨/公顷 | 2026-9 |
| 1986/1987 | 0.86 | 吨/公顷 | 2026-9 |
| 1985/1986 | 0.815 | 吨/公顷 | 2026-9 |
| 1984/1985 | 1.092 | 吨/公顷 | 2026-9 |
| 1983/1984 | 0.79 | 吨/公顷 | 2026-9 |
| 1982/1983 | 0.862 | 吨/公顷 | 2026-9 |
| 1981/1982 | 0.54 | 吨/公顷 | 2026-9 |
| 1980/1981 | 0.741 | 吨/公顷 | 2026-9 |
| 1979/1980 | 0.79 | 吨/公顷 | 2026-9 |
| 1978/1979 | 0.805 | 吨/公顷 | 2026-9 |
| 1977/1978 | 0.712 | 吨/公顷 | 2026-9 |
| 1976/1977 | 0.615 | 吨/公顷 | 2026-9 |
| 1975/1976 | 0.525 | 吨/公顷 | 2026-9 |
| 1974/1975 | 0.65 | 吨/公顷 | 2026-9 |
| 1973/1974 | 0.704 | 吨/公顷 | 2026-9 |
| 1972/1973 | 0.706 | 吨/公顷 | 2026-9 |