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I don't think you'll find enough votes here to differentiate between years - especially since you left out one important aspect: instead of separating by year I would try to find 'Garaged vs 'Not Garaged (at least significant part of the day)' although that does feel a little bit like one of those studies from the 70's where you are trying to find out if the divorce rate is higher in high-rise low income quarters..
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