You're missing the obvious lads. The stats look like that because bugger all women ride or pillion, despite what sometimes seems like visibly more women being involved. The ratio, in my experience is about the same as it was 20 years ago. 1 woman riding or pillioning per 10 blokes.
Having said that, I reckon you'd find that a lot more female pillions with male riders die than female riders. Or female pillions with female riders.
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