I would guess over 80. Some of the earliest super spreaders identified when this all started where singers in churches. One lady in South Korea infected a large part of an audience in the 100's. Ignoring what others tell you if you look at two particular people in this picture it is fairly obvious:
There is guy near the middle of that photo with the jeans and the brown gloves. Look at the air around him because of the mask he wears. Almost zero visible breath. Almost all droplets exiting his lungs are stopped at the mask point. Compare him to the guy a few spots to the right with the red hat who is breathing without a mask. You can barely see the face of the person to his left the cloud of breath is so large. If you wore a mask in a crowd of infected people who do not wear a mask you will probably get the virus. If you where in the same crowd but they all had masks and you did not you would probably be fine. If we all wear masks in public the chance of the virus being in the air or on surfaces drops massively. This picture is a great way of showing visually what happens.
Hoping this visual analogy can assist some to see how it works. It certainly made things crystal clear to me and reconfirmed what a few doctors have told me who know about a million times more than me about this whole situation.