On average, should be about 5%. Hexaploid genetics show a doping effect where more copies of the gene for male flowers triggers differentiation where both male and female flowers occur on the same plant. It looks like 4 copies of the male gene are the bend point. 4, 5, or 6 copies = male. 3 copies looks like can make both male and female flowers. 1 or 2 copies always produces female flowers except if there is a mutation which can happen where a single limb on an otherwise female tree starts producing male flowers. This is unproven, but is the most viable explanation of the observations.
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