stock pick of the week, page-14

I am just reading MIG's halfyearly e/s from ComSec's website:

Period Ending 1HY 2HY Full Year
30-06-2003 26.4 -0.3 26.1
30-06-2002_ 8.7 24.8 33.6
30-06-2001 14.0 - 6.4 7.7
30-06-2000 -7.9 13.7 5.7
30-06-1999 26.0 _9.1 35.1
30-06-1998_ 9.9 10.3 20.1
30-06-1997_ ---- ---- 10.7

Would any one explain to me:

(1) Why its e/s so volotile?
(2) Why its e/s of 2nd half of year 2002-03 is negative (-0.3 c/s) ?

Thanks.

zwu