| 年度 | 数值 | 单位 | 发布日期 |
|---|---|---|---|
| 1990/1991 | 173 | 千公顷 | 2026-9 |
| 1989/1990 | 134 | 千公顷 | 2026-9 |
| 1988/1989 | 165 | 千公顷 | 2026-9 |
| 1987/1988 | 200 | 千公顷 | 2026-9 |
| 1986/1987 | 104 | 千公顷 | 2026-9 |
| 1985/1986 | 94 | 千公顷 | 2026-9 |
| 1984/1985 | 83 | 千公顷 | 2026-9 |
| 1983/1984 | 72 | 千公顷 | 2026-9 |
| 1982/1983 | 51 | 千公顷 | 2026-9 |
| 1981/1982 | 43 | 千公顷 | 2026-9 |
| 1980/1981 | 32 | 千公顷 | 2026-9 |
| 1979/1980 | 34 | 千公顷 | 2026-9 |
| 1978/1979 | 23 | 千公顷 | 2026-9 |
| 1977/1978 | 31 | 千公顷 | 2026-9 |
| 1976/1977 | 25 | 千公顷 | 2026-9 |
| 1975/1976 | 25 | 千公顷 | 2026-9 |
| 1974/1975 | 17 | 千公顷 | 2026-9 |
| 1973/1974 | 14 | 千公顷 | 2026-9 |
| 1972/1973 | 9 | 千公顷 | 2026-9 |
| 1971/1972 | 9 | 千公顷 | 2026-9 |