| 序号 | 时间 (年) |
数据 (千公顷) |
|---|---|---|
| 1 | 2020 | |
| 2 | 2019 | |
| 3 | 2018 | |
| 4 | 2016 | |
| 5 | 2015 | |
| 6 | 2014 | |
| 7 | 2013 | 21.15 |
| 8 | 2012 | 20.94 |
| 9 | 2011 | 20.96 |
| 10 | 2010 | 21.11 |
| 11 | 2009 | 21.49 |
| 12 | 2008 | 21.89 |
| 13 | 2007 | 21.18 |
| 14 | 2006 | 22.95 |
| 15 | 2005 | 22.97 |
| 16 | 2004 | 22.76 |
| 17 | 2003 | 22.05 |
| 18 | 2002 | 22.80 |
| 19 | 2001 | 23.57 |
| 20 | 2000 | 24.22 |
| 21 | 1999 | 26.83 |
