Sangamo 22 days to cover short position

With last weeks low volume and substantial short position it would take 22 days of trading to cover the short position in Sangamo BioSciences (SGMO).
Shares short as of 3/31/15 - 8,285,803
Avg daily volume last week - 378,789

DATE                                   SHORT INTEREST
3/31/15                                  8,285,803
3/13/15                                  8,441,291
2/27/15                                  8,939,000
2/13/15                                  9,268,065
1/30/15                                  9,082,814
1/15/15                                  9,387,913


SYMBOL                             % of SHARES OUTSTANDING SHORT
SGMO                                                            12%
JUNO                                                               5%
BLUE                                                               7%
QURE                                                               1%
CLLS                                                                1%