| 年度 | 数值 | 单位 | 发布日期 |
|---|---|---|---|
| 1989/1990 | 2.059 | 吨/公顷 | 2026-9 |
| 1988/1989 | 1.962 | 吨/公顷 | 2026-9 |
| 1987/1988 | 1.936 | 吨/公顷 | 2026-9 |
| 1986/1987 | 2.376 | 吨/公顷 | 2026-9 |
| 1985/1986 | 2.08 | 吨/公顷 | 2026-9 |
| 1984/1985 | 1.901 | 吨/公顷 | 2026-9 |
| 1983/1984 | 1.829 | 吨/公顷 | 2026-9 |
| 1982/1983 | 1.464 | 吨/公顷 | 2026-9 |
| 1981/1982 | 1.668 | 吨/公顷 | 2026-9 |
| 1980/1981 | 1.678 | 吨/公顷 | 2026-9 |
| 1979/1980 | 2.043 | 吨/公顷 | 2026-9 |
| 1978/1979 | 2.165 | 吨/公顷 | 2026-9 |
| 1977/1978 | 2.292 | 吨/公顷 | 2026-9 |
| 1976/1977 | 1.823 | 吨/公顷 | 2026-9 |
| 1975/1976 | 1.402 | 吨/公顷 | 2026-9 |
| 1974/1975 | 1.483 | 吨/公顷 | 2026-9 |
| 1973/1974 | 1.938 | 吨/公顷 | 2026-9 |
| 1972/1973 | 1.62 | 吨/公顷 | 2026-9 |