| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1998/1999 | 3 | 吨/公顷 | 2026-9 |
| 1997/1998 | 3 | 吨/公顷 | 2026-9 |
| 1996/1997 | 3 | 吨/公顷 | 2026-9 |
| 1995/1996 | 3 | 吨/公顷 | 2026-9 |
| 1994/1995 | 2.3 | 吨/公顷 | 2026-9 |
| 1993/1994 | 2.143 | 吨/公顷 | 2026-9 |
| 1992/1993 | 2.143 | 吨/公顷 | 2026-9 |
| 1991/1992 | 2.778 | 吨/公顷 | 2026-9 |
| 1990/1991 | 3.167 | 吨/公顷 | 2026-9 |
| 1989/1990 | 2.333 | 吨/公顷 | 2026-9 |
| 1988/1989 | 3.692 | 吨/公顷 | 2026-9 |
| 1987/1988 | 3.2 | 吨/公顷 | 2026-9 |
| 1986/1987 | 3.2 | 吨/公顷 | 2026-9 |
| 1985/1986 | 3.2 | 吨/公顷 | 2026-9 |
| 1984/1985 | 2.539 | 吨/公顷 | 2026-9 |
| 1983/1984 | 3.692 | 吨/公顷 | 2026-9 |
| 1982/1983 | 3.692 | 吨/公顷 | 2026-9 |
| 1981/1982 | 2.923 | 吨/公顷 | 2026-9 |
| 1980/1981 | 1.6 | 吨/公顷 | 2026-9 |
| 1979/1980 | 2.05 | 吨/公顷 | 2026-9 |
| 1978/1979 | 0.917 | 吨/公顷 | 2026-9 |
| 1977/1978 | 1.25 | 吨/公顷 | 2026-9 |
| 1976/1977 | 1.143 | 吨/公顷 | 2026-9 |
| 1975/1976 | 2.519 | 吨/公顷 | 2026-9 |
| 1974/1975 | 2 | 吨/公顷 | 2026-9 |
| 1973/1974 | 2.519 | 吨/公顷 | 2026-9 |
| 1972/1973 | 2.143 | 吨/公顷 | 2026-9 |
| 1971/1972 | 2.577 | 吨/公顷 | 2026-9 |
| 1970/1971 | 1.957 | 吨/公顷 | 2026-9 |
| 1969/1970 | 2.273 | 吨/公顷 | 2026-9 |
| 1968/1969 | 1.952 | 吨/公顷 | 2026-9 |
| 1967/1968 | 2.15 | 吨/公顷 | 2026-9 |
| 1966/1967 | 1.632 | 吨/公顷 | 2026-9 |
| 1965/1966 | 1.235 | 吨/公顷 | 2026-9 |
| 1964/1965 | 1.944 | 吨/公顷 | 2026-9 |
| 1963/1964 | 2.526 | 吨/公顷 | 2026-9 |
| 1962/1963 | 1.895 | 吨/公顷 | 2026-9 |
| 1961/1962 | 1.727 | 吨/公顷 | 2026-9 |
| 1960/1961 | 1.607 | 吨/公顷 | 2026-9 |