In the past, if you made 40% strikes you were looking good, and when you didn't strike, the mistake was fairly minor, so your average pin count was probably 9.2 or so.
The important thing is missing a single pin spare was like committing a crime.
Now you see strike percentages are higher, but since there is so much help by the oil, to not strike usually means the shot was so bad even the oil couldn't help it back, so you see more 6-7 counts.
And spare shooting is a lost art.
So averaging 200 the old way, pin count average 9.2, opens maybe 1 per night so according to the stats that would be 1/30 or 3% opens.
The new way you could probably get away with an 8.8 pin count average, and 3 to 4 opens per night for 10-13%, as long as your strike % is north of 55%
The stat program doesn't seem to count opens per spare attempts, just opens per frame.
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