2 people could tell actually. Those results came in after the OP stopped maintaining the thread. 3 if you include a previous success at the same bitrate by one poster.
We do not know however how many folks did this test and did not report their results so we do not know if it was 1/20 or 1/100.
Not that this makes your achievement any less impressive.
Since I am not blessed with your ears I will keep encoding in MP3