Issue year | Number of issues | Change in short interest | Shares outstanding | ||
Year | N | Mean | Std. Dev. | Mean | Std. Dev. |
2006 | 69 | 0.8853 | 3.3365 | 182,111.68 | 387,055.46 |
2007 | 79 | 2.0595 | 3.2143 | 115,093.06 | 214,482.7 |
2008 | 67 | 1.2382 | 2.6363 | 176,394.45 | 357,651.76 |
2009 | 78 | 1.9771 | 2.7208 | 251,544.17 | 776,325.63 |
2010 | 59 | 0.8251 | 5.2471 | 638,575.61 | 1,838,559.92 |
2011 | 57 | 1.9653 | 2.1677 | 627,543.61 | 3,836,712.22 |
2012 | 60 | 1.6867 | 2.3589 | 139,105.15 | 211,435.88 |