How Rare is Perry's Vocal Classification of Tenor Altino?

I was looking for something on Wikipedia, and I found this interesting paragraph from Steve Perry's Wiki page:
This got me to wondering how many men have a voice in this classification. I wouldn't imagine that more than 1% of men would be able to sing in that register without going falsetto. Does anyone know?
I wonder if Arnel's voice is a tenor altino? I'm pretty sure Steve Augeri and Jeff Scott Soto are not in that classification.
I knew Perry was a high tenor, but I didn't know there was a classification for men who sing higher than the tenor range.

Perry's vocal classification is tenor altino, a term used to describe a man who sings in the highest possible male register (above tenor and including what would if sung by a woman be called alto or mezzo), using a natural or "chest" voice and employing falsetto only in his extreme upper register. Depending on whether the definition being used includes chest voice or is limited to falsetto only, this is also a form of countertenor.
This got me to wondering how many men have a voice in this classification. I wouldn't imagine that more than 1% of men would be able to sing in that register without going falsetto. Does anyone know?
I wonder if Arnel's voice is a tenor altino? I'm pretty sure Steve Augeri and Jeff Scott Soto are not in that classification.
I knew Perry was a high tenor, but I didn't know there was a classification for men who sing higher than the tenor range.
