I can use a label that is #1, but I can't use a label that is 100%

It appears that after experimenting with symbols ($, #, *, %) and numbers (1, 2, 3, 4) that the label/tag cloud widget will allow $, #, and *, but not %. It will allow numbers.

So I can put in labels that are say something is the "#1 team" or worth "$100."

But I can't say, for example, that this label/tag cloud working in Blogger is "100% bug free."