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Just some quick, dirty math comparing OH and Feet record progression:
Since 2007 dividing the end-of-year WR average for feet by the same number for OH has resulted in a figure ranging from 2.41 (2013) to 2.85 (2010) with an average value of 2.617. This single divided by the current OH WR single is 2.465. Not sure what that means, but I think it's interesting.