| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1998/1999 | 1.379 | 吨/公顷 | 2026-9 |
| 1997/1998 | 1.952 | 吨/公顷 | 2026-9 |
| 1996/1997 | 1.438 | 吨/公顷 | 2026-9 |
| 1995/1996 | 1.48 | 吨/公顷 | 2026-9 |
| 1994/1995 | 1.438 | 吨/公顷 | 2026-9 |
| 1993/1994 | 1.234 | 吨/公顷 | 2026-9 |
| 1992/1993 | 0.759 | 吨/公顷 | 2026-9 |
| 1991/1992 | 1.657 | 吨/公顷 | 2026-9 |
| 1990/1991 | 0.742 | 吨/公顷 | 2026-9 |
| 1989/1990 | 0.594 | 吨/公顷 | 2026-9 |
| 1988/1989 | 1 | 吨/公顷 | 2026-9 |
| 1987/1988 | 1 | 吨/公顷 | 2026-9 |
| 1986/1987 | 1.513 | 吨/公顷 | 2026-9 |
| 1985/1986 | 0.994 | 吨/公顷 | 2026-9 |
| 1984/1985 | 1.394 | 吨/公顷 | 2026-9 |
| 1983/1984 | 0.942 | 吨/公顷 | 2026-9 |
| 1982/1983 | 1.119 | 吨/公顷 | 2026-9 |
| 1981/1982 | 0.865 | 吨/公顷 | 2026-9 |
| 1980/1981 | 1.231 | 吨/公顷 | 2026-9 |
| 1979/1980 | 1.268 | 吨/公顷 | 2026-9 |
| 1978/1979 | 1.139 | 吨/公顷 | 2026-9 |
| 1977/1978 | 1.117 | 吨/公顷 | 2026-9 |
| 1976/1977 | 1.365 | 吨/公顷 | 2026-9 |
| 1975/1976 | 1.76 | 吨/公顷 | 2026-9 |
| 1974/1975 | 1.252 | 吨/公顷 | 2026-9 |
| 1973/1974 | 1.333 | 吨/公顷 | 2026-9 |
| 1972/1973 | 1.706 | 吨/公顷 | 2026-9 |
| 1971/1972 | 1.13 | 吨/公顷 | 2026-9 |
| 1970/1971 | 1.152 | 吨/公顷 | 2026-9 |
| 1969/1970 | 0.944 | 吨/公顷 | 2026-9 |
| 1968/1969 | 0.959 | 吨/公顷 | 2026-9 |
| 1967/1968 | 0.837 | 吨/公顷 | 2026-9 |
| 1966/1967 | 1.177 | 吨/公顷 | 2026-9 |
| 1965/1966 | 0.5 | 吨/公顷 | 2026-9 |
| 1964/1965 | 0.5 | 吨/公顷 | 2026-9 |