| Year | Number of samples | The proportion (%) | The number of stock samples that can be sold short |
| 2008 | 1171 | 6.84 | 0 |
| 2009 | 1237 | 7.22 | 0 |
| 2010 | 1378 | 8.05 | 48 |
| 2011 | 1783 | 10.41 | 156 |
| 2012 | 2119 | 12.38 | 167 |
| 2013 | 2222 | 12.98 | 569 |
| 2014 | 2237 | 13.07 | 750 |
| 2015 | 2366 | 13.82 | 754 |
| 2016 | 2609 | 15.24 | 847 |