| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1990/1991 | 1.11 | 吨/公顷 | 2026-9 |
| 1989/1990 | 1.486 | 吨/公顷 | 2026-9 |
| 1988/1989 | 1.563 | 吨/公顷 | 2026-9 |
| 1987/1988 | 1.485 | 吨/公顷 | 2026-9 |
| 1986/1987 | 1.595 | 吨/公顷 | 2026-9 |
| 1985/1986 | 1.37 | 吨/公顷 | 2026-9 |
| 1984/1985 | 1.266 | 吨/公顷 | 2026-9 |
| 1983/1984 | 1.131 | 吨/公顷 | 2026-9 |
| 1982/1983 | 1.022 | 吨/公顷 | 2026-9 |
| 1981/1982 | 1.587 | 吨/公顷 | 2026-9 |
| 1980/1981 | 1.383 | 吨/公顷 | 2026-9 |
| 1979/1980 | 1.225 | 吨/公顷 | 2026-9 |
| 1978/1979 | 1.31 | 吨/公顷 | 2026-9 |
| 1977/1978 | 1.689 | 吨/公顷 | 2026-9 |
| 1976/1977 | 1.597 | 吨/公顷 | 2026-9 |
| 1975/1976 | 1.927 | 吨/公顷 | 2026-9 |
| 1974/1975 | 1.656 | 吨/公顷 | 2026-9 |
| 1973/1974 | 1.469 | 吨/公顷 | 2026-9 |
| 1972/1973 | 1.695 | 吨/公顷 | 2026-9 |
| 1971/1972 | 1.754 | 吨/公顷 | 2026-9 |
| 1970/1971 | 1.644 | 吨/公顷 | 2026-9 |
| 1969/1970 | 1.474 | 吨/公顷 | 2026-9 |