SGC does break out the T215-1 and T215-2 sets in their pop reports.
Here is a link to the T215-1 set:
http://www.sgccard.com/PopulationReport.aspx?setid=3890
They list 145 graded. There are a number of instances of incorrect labeling, as they sometimes grade Type 2 cards as Type 1, and vice versa. From what I have observed, there's no obvious bias as to which are labeled incorrectly more often, so I think you can take it as a decent number.
Just for additional reference, here's a link to the T215-2 pop report... Currently 135 graded.
http://www.sgccard.com/PopulationReport.aspx?setid=1433
Cheers,
Steve