| 序号 | 时间 (年) |
数据 (万头) |
|---|---|---|
| 1 | 2020 | |
| 2 | 2019 | |
| 3 | 2018 | |
| 4 | 2017 | |
| 5 | 2016 | |
| 6 | 2015 | |
| 7 | 2014 | 20.51 |
| 8 | 2013 | 20.41 |
| 9 | 2012 | 20.87 |
| 10 | 2011 | 21.47 |
| 11 | 2010 | 22.10 |
| 12 | 2009 | 21.90 |
| 13 | 2008 | 13.38 |
| 14 | 2007 | 9.36 |
| 15 | 2006 | 16.35 |
| 16 | 2005 | 16.11 |
| 17 | 2004 | 15.38 |
| 18 | 2003 | 14.19 |
| 19 | 2002 | 12.75 |
| 20 | 2001 | 11.16 |
| 21 | 2000 | 6.75 |
| 22 | 1999 | 4.36 |
| 23 | 1998 | 3.28 |
| 24 | 1995 | 2.93 |
| 25 | 1990 | 3.49 |
| 26 | 1985 | 3.15 |
