| 序号 | 时间 (年) |
数据 (万公顷) |
|---|---|---|
| 1 | 2017 | |
| 2 | 2016 | |
| 3 | 2015 | |
| 4 | 2014 | |
| 5 | 2013 | |
| 6 | 2012 | |
| 7 | 2011 | 33.39 |
| 8 | 2010 | 29.15 |
| 9 | 2009 | 22.08 |
| 10 | 2008 | 16.31 |
| 11 | 2007 | 22.65 |
| 12 | 2006 | 23.25 |
| 13 | 2005 | 16.32 |
| 14 | 2004 | 17.87 |
| 15 | 2003 | 19.36 |
| 16 | 2002 | 12.42 |
| 17 | 2001 | 9.04 |
| 18 | 2000 | 4.86 |
| 19 | 1999 | 4.54 |
