Take out the boxes and calculate percentage.
303 43.3%
30-30 16.7%
25-35 13.3%
32-40 10.0%
38-55 16.7%
These results are based on only 30 tools. There must be more data available. Does anyone have access to the antique tool collector's sight? (they charge $35/year now) Maybe a survey of their members would generate a larger sample.
BillR
