If the numbers are in column A, put this in B1 and copy down.
=RIGHT(A!,2)
Then do Copy > PasteSPecial > values on column B to get rid of the formulas.
Then sort on column B
Or, if you don't have the time, space or patience to do that and need to do
this sorting frequently, perhaps Jim Cone's fine commercial Add-in called
"SpecialSort" would do for you. It's available at:
http://www.realezsites.com/bus/primitivesoftware/products.php
Vaya con Dios,
Chuck, CABGx3