Yes, input masks will probably do the trick for you, try using something like:
90.99\%;0;_
If you chage the 9 to 0 then that will force everything to print. Of course you will have to modify it to fit your needs.
Can you direct me to a good document that explains what those input mask characters really do in the situation? The instructions within Access really stink and are not very helpful for troubleshooting.