| 序号 | 时间 (年) |
数据 (万头) |
|---|---|---|
| 1 | 2021 | |
| 2 | 2020 | |
| 3 | 2019 | |
| 4 | 2018 | |
| 5 | 2017 | |
| 6 | 2016 | |
| 7 | 2015 | |
| 8 | 2014 | |
| 9 | 2013 | |
| 10 | 2012 | |
| 11 | 2011 | 38.65 |
| 12 | 2010 | 36.26 |
| 13 | 2009 | 37.07 |
| 14 | 2008 | 36.98 |
| 15 | 2007 | 37.09 |
| 16 | 2006 | 35.39 |
| 17 | 2005 | 35.32 |
| 18 | 2004 | 32.13 |
| 19 | 2003 | 30.79 |
| 20 | 2002 | 25.33 |
| 21 | 2001 | 25.12 |
| 22 | 2000 | 23.09 |
| 23 | 1999 | 21.62 |
| 24 | 1998 | 21.48 |
| 25 | 1997 | 19.33 |
| 26 | 1995 | 20.17 |
| 27 | 1990 | 21.21 |
| 28 | 1985 | 17.20 |
