| 年度 | 数值 | 单位 | 发布日期 |
|---|---|---|---|
| 2005/2006 | 0 | 吨/公顷 | 2026-9 |
| 2003/2004 | 0 | 吨/公顷 | 2026-9 |
| 2001/2002 | 0 | 吨/公顷 | 2026-9 |
| 2000/2001 | 0 | 吨/公顷 | 2026-9 |
| 1999/2000 | 0 | 吨/公顷 | 2026-9 |
| 1998/1999 | 1.667 | 吨/公顷 | 2026-9 |
| 1997/1998 | 1.667 | 吨/公顷 | 2026-9 |
| 1996/1997 | 1.6 | 吨/公顷 | 2026-9 |
| 1995/1996 | 2 | 吨/公顷 | 2026-9 |
| 1994/1995 | 1.375 | 吨/公顷 | 2026-9 |
| 1993/1994 | 1.4 | 吨/公顷 | 2026-9 |
| 1992/1993 | 1.4 | 吨/公顷 | 2026-9 |
| 1991/1992 | 1.6 | 吨/公顷 | 2026-9 |
| 1990/1991 | 1.4 | 吨/公顷 | 2026-9 |
| 1989/1990 | 1.333 | 吨/公顷 | 2026-9 |
| 1988/1989 | 1.571 | 吨/公顷 | 2026-9 |
| 1987/1988 | 0.929 | 吨/公顷 | 2026-9 |