Almost poop-ed paints when I saw your post with the dates on the options.... i believe you are a year out.
from exe webpage (and check with ASX page).
Capital Structure
Tradeable Shares on Issue (EXE) 209,735,000
Total Shares on Issue 227,976,250
Tradeable Options (EXEO)
(20 exercise price @ 31 March 2011) 73,976,250
Tradeable Options (EXEOA)
10 exercise price @ 30 September 2012 153,976,250
