Here is a link that may help.
[http://ai.eecs.umich.edu/people/conway/TS/TSprevalence.html]http://ai.eecs.umich.edu/people/conway/TS/TSprevalence.html[/URL]
I didn't read the whole text, look at "TABLE 2" in the middle of the side. Say half often for 1 TG side.
This is only for USA, in some cultures there are more and in other are lesser. You can use this as clue.
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