You can make this kind of thing with Graph Builder:
(for 20 you might need a big screen though).
To do this, drag your X variable to the 'X' drop zone, then one of the Y variables to the 'Y' drop zone. Then add each of the remaining Y variables in turn, being sure to drop it 'above' the one that is already there (you should see a new, blue drop zone appear). Once you have done it once, you can save the script ('select 'Script > Save Script to Data Table') to repeat with updated data.