According to ASIC, the reported short positions have been in decline since the start of 2012.
As recent as June 4th they were less than 1% of issued shares.
Link :- http://www.asic.gov.au/short-position-reports
I wonder if its instos balancing books or a substantial holder reducing their holding?
I don't know but the selling for the past couple of days has been over powering to say the least.