Ok, I see. What is the datatype of the availability column in the table? If it is an integer than you will not see the %. In that case you can go into the table customizer and add a suffix or number format on that column.
@dtamada The error message you would’ve got entering this into an expression binding, “Unknown function: ‘numberfomat’” is your tip that you’ve misspelled the function name:
It’s numberFormat (not numberfomat, missing “r”).
P.S. It’s usually better to start a new topic rather than resurrect a really old one. The original poster was trying to use the expression in scripting (where it doesn’t work).
I was focused on what would keep your expressiong from evaluating, but as @pturmel notes, tag() gives poor performance. A better way to accomplish this would be via an Indirect Tag binding something like this:
Then do the numberFormat on the value you get from the indirect binding.