| 年度 | 数值 | 单位 | 发布日期 |
|---|
| 1998/1999 | 1.65 | 吨/公顷 | 2026-9 |
| 1997/1998 | 1.222 | 吨/公顷 | 2026-9 |
| 1996/1997 | 1.684 | 吨/公顷 | 2026-9 |
| 1995/1996 | 1.487 | 吨/公顷 | 2026-9 |
| 1994/1995 | 1.614 | 吨/公顷 | 2026-9 |
| 1993/1994 | 1.786 | 吨/公顷 | 2026-9 |
| 1992/1993 | 1.771 | 吨/公顷 | 2026-9 |
| 1991/1992 | 2.049 | 吨/公顷 | 2026-9 |
| 1990/1991 | 1.945 | 吨/公顷 | 2026-9 |
| 1989/1990 | 1.944 | 吨/公顷 | 2026-9 |
| 1988/1989 | 1.95 | 吨/公顷 | 2026-9 |
| 1987/1988 | 2.093 | 吨/公顷 | 2026-9 |
| 1986/1987 | 2.192 | 吨/公顷 | 2026-9 |
| 1985/1986 | 1.962 | 吨/公顷 | 2026-9 |
| 1984/1985 | 1.893 | 吨/公顷 | 2026-9 |
| 1983/1984 | 2.066 | 吨/公顷 | 2026-9 |
| 1982/1983 | 1.96 | 吨/公顷 | 2026-9 |
| 1981/1982 | 2.076 | 吨/公顷 | 2026-9 |
| 1980/1981 | 1.67 | 吨/公顷 | 2026-9 |
| 1979/1980 | 1.829 | 吨/公顷 | 2026-9 |
| 1978/1979 | 1.477 | 吨/公顷 | 2026-9 |
| 1977/1978 | 1.529 | 吨/公顷 | 2026-9 |
| 1976/1977 | 1.37 | 吨/公顷 | 2026-9 |
| 1975/1976 | 1.194 | 吨/公顷 | 2026-9 |
| 1974/1975 | 1.062 | 吨/公顷 | 2026-9 |
| 1973/1974 | 1.476 | 吨/公顷 | 2026-9 |
| 1972/1973 | 1.222 | 吨/公顷 | 2026-9 |