| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1998/1999 | 2.358 | 吨/公顷 | 2026-9 |
| 1997/1998 | 1.877 | 吨/公顷 | 2026-9 |
| 1996/1997 | 1.587 | 吨/公顷 | 2026-9 |
| 1995/1996 | 2.272 | 吨/公顷 | 2026-9 |
| 1994/1995 | 2.043 | 吨/公顷 | 2026-9 |
| 1993/1994 | 1.702 | 吨/公顷 | 2026-9 |
| 1992/1993 | 1.813 | 吨/公顷 | 2026-9 |
| 1991/1992 | 2.229 | 吨/公顷 | 2026-9 |
| 1990/1991 | 2.412 | 吨/公顷 | 2026-9 |
| 1989/1990 | 2.783 | 吨/公顷 | 2026-9 |
| 1988/1989 | 2.546 | 吨/公顷 | 2026-9 |
| 1987/1988 | 2.389 | 吨/公顷 | 2026-9 |
| 1986/1987 | 2.52 | 吨/公顷 | 2026-9 |
| 1985/1986 | 2.298 | 吨/公顷 | 2026-9 |
| 1984/1985 | 2.301 | 吨/公顷 | 2026-9 |
| 1983/1984 | 2.243 | 吨/公顷 | 2026-9 |
| 1982/1983 | 1.676 | 吨/公顷 | 2026-9 |
| 1981/1982 | 1.787 | 吨/公顷 | 2026-9 |
| 1980/1981 | 1.788 | 吨/公顷 | 2026-9 |
| 1979/1980 | 1.294 | 吨/公顷 | 2026-9 |
| 1978/1979 | 2.05 | 吨/公顷 | 2026-9 |
| 1977/1978 | 1.77 | 吨/公顷 | 2026-9 |
| 1976/1977 | 2.462 | 吨/公顷 | 2026-9 |
| 1975/1976 | 2.35 | 吨/公顷 | 2026-9 |
| 1974/1975 | 2.027 | 吨/公顷 | 2026-9 |
| 1973/1974 | 1.625 | 吨/公顷 | 2026-9 |
| 1972/1973 | 1.558 | 吨/公顷 | 2026-9 |
| 1971/1972 | 1.644 | 吨/公顷 | 2026-9 |
| 1970/1971 | 1.899 | 吨/公顷 | 2026-9 |
| 1969/1970 | 1.378 | 吨/公顷 | 2026-9 |
| 1968/1969 | 1.972 | 吨/公顷 | 2026-9 |
| 1967/1968 | 2.067 | 吨/公顷 | 2026-9 |
| 1966/1967 | 1.647 | 吨/公顷 | 2026-9 |
| 1965/1966 | 1.839 | 吨/公顷 | 2026-9 |
| 1964/1965 | 1.127 | 吨/公顷 | 2026-9 |