Hide and show a variable

Hi all

I know this is simple, but it's not working for me.

Polish Tax law states that any 0 value must not be shown. I a tax rate and when it says '0 %' they want to see blank.

So I added this and it's not working. It does blank '0 %' but it also blanks out '7 %' etc too

<?xdoxslt:ifelse(Tax_Rate_Or_N_A_ID19='0 %',Tax_Rate_Or_N_A_ID19,' ')?>

<?xdoxslt:ifelse(condition,true,false)?>

Any help please?

Thanks

John