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