| Year | Number of observation | Short selling term |
| 2007 | 800 | 0 |
| 2008 | 850 | 0 |
| 2009 | 953 | 0 |
| 2010 | 1140 | 55 |
| 2011 | 1261 | 189 |
| 2012 | 1357 | 187 |
| 2013 | 1378 | 430 |
| 2014 | 1466 | 543 |
| 2015 | 1576 | 680 |
| 2016 | 1715 | 691 |
| 合计 | 12496 | 2775 |