| 序号 | 时间 (年) |
数据 (万头) |
|---|---|---|
| 1 | 2020 | |
| 2 | 2019 | |
| 3 | 2018 | |
| 4 | 2017 | |
| 5 | 2016 | |
| 6 | 2015 | |
| 7 | 2014 | 2.77 |
| 8 | 2013 | 2.82 |
| 9 | 2012 | 2.98 |
| 10 | 2011 | 3.73 |
| 11 | 2010 | 3.73 |
| 12 | 2009 | 4.08 |
| 13 | 2008 | 4.59 |
| 14 | 2007 | 5.40 |
| 15 | 2006 | 5.48 |
| 16 | 2005 | 6.39 |
| 17 | 2004 | 5.73 |
| 18 | 2003 | 5.98 |
| 19 | 2002 | 11.82 |
| 20 | 2001 | 10.62 |
| 21 | 2000 | 12.57 |
| 22 | 1999 | 9.65 |
| 23 | 1998 | 11.77 |
| 24 | 1995 | 18.79 |
| 25 | 1990 | 16.55 |
| 26 | 1985 | 11.88 |
