| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1990/1991 | 270 | 千公顷 | 2026-9 |
| 1989/1990 | 231 | 千公顷 | 2026-9 |
| 1988/1989 | 199 | 千公顷 | 2026-9 |
| 1987/1988 | 250 | 千公顷 | 2026-9 |
| 1986/1987 | 227 | 千公顷 | 2026-9 |
| 1985/1986 | 217 | 千公顷 | 2026-9 |
| 1984/1985 | 191 | 千公顷 | 2026-9 |
| 1983/1984 | 162 | 千公顷 | 2026-9 |
| 1982/1983 | 152 | 千公顷 | 2026-9 |
| 1981/1982 | 132 | 千公顷 | 2026-9 |
| 1980/1981 | 103 | 千公顷 | 2026-9 |
| 1979/1980 | 65 | 千公顷 | 2026-9 |
| 1978/1979 | 47 | 千公顷 | 2026-9 |
| 1977/1978 | 39 | 千公顷 | 2026-9 |
| 1976/1977 | 44 | 千公顷 | 2026-9 |
| 1975/1976 | 72 | 千公顷 | 2026-9 |
| 1974/1975 | 48 | 千公顷 | 2026-9 |
| 1973/1974 | 46 | 千公顷 | 2026-9 |
| 1972/1973 | 31 | 千公顷 | 2026-9 |
| 1971/1972 | 25 | 千公顷 | 2026-9 |
| 1970/1971 | 13 | 千公顷 | 2026-9 |
| 1969/1970 | 12 | 千公顷 | 2026-9 |
| 1968/1969 | 15 | 千公顷 | 2026-9 |
| 1967/1968 | 20 | 千公顷 | 2026-9 |
| 1966/1967 | 21 | 千公顷 | 2026-9 |
| 1965/1966 | 27 | 千公顷 | 2026-9 |
| 1964/1965 | 25 | 千公顷 | 2026-9 |