| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1998/1999 | 145 | 千公顷 | 2026-9 |
| 1997/1998 | 62 | 千公顷 | 2026-9 |
| 1996/1997 | 80 | 千公顷 | 2026-9 |
| 1995/1996 | 73 | 千公顷 | 2026-9 |
| 1994/1995 | 64 | 千公顷 | 2026-9 |
| 1993/1994 | 77 | 千公顷 | 2026-9 |
| 1992/1993 | 166 | 千公顷 | 2026-9 |
| 1991/1992 | 108 | 千公顷 | 2026-9 |
| 1990/1991 | 190 | 千公顷 | 2026-9 |
| 1989/1990 | 512 | 千公顷 | 2026-9 |
| 1988/1989 | 340 | 千公顷 | 2026-9 |
| 1987/1988 | 350 | 千公顷 | 2026-9 |
| 1986/1987 | 312 | 千公顷 | 2026-9 |
| 1985/1986 | 319 | 千公顷 | 2026-9 |
| 1984/1985 | 292 | 千公顷 | 2026-9 |
| 1983/1984 | 275 | 千公顷 | 2026-9 |
| 1982/1983 | 269 | 千公顷 | 2026-9 |
| 1981/1982 | 310 | 千公顷 | 2026-9 |
| 1980/1981 | 364 | 千公顷 | 2026-9 |
| 1979/1980 | 302 | 千公顷 | 2026-9 |
| 1978/1979 | 202 | 千公顷 | 2026-9 |
| 1977/1978 | 171 | 千公顷 | 2026-9 |
| 1976/1977 | 156 | 千公顷 | 2026-9 |
| 1975/1976 | 121 | 千公顷 | 2026-9 |
| 1974/1975 | 238 | 千公顷 | 2026-9 |
| 1973/1974 | 183 | 千公顷 | 2026-9 |
| 1972/1973 | 109 | 千公顷 | 2026-9 |
| 1971/1972 | 146 | 千公顷 | 2026-9 |
| 1970/1971 | 79 | 千公顷 | 2026-9 |
| 1969/1970 | 54 | 千公顷 | 2026-9 |
| 1968/1969 | 49 | 千公顷 | 2026-9 |
| 1967/1968 | 49 | 千公顷 | 2026-9 |
| 1966/1967 | 17 | 千公顷 | 2026-9 |
| 1965/1966 | 6 | 千公顷 | 2026-9 |
| 1964/1965 | 4 | 千公顷 | 2026-9 |