Given that we have very few examples, we could not, statistically, draw any significance from any apparent bias. It's also hard to see any theoretical basis for expecting a bias, so my gut feeling would be there probably is no bias.
It's also worth remembering that human observations of these things are essentially a very brief snapshot in a huge period during which we have no idea about what may have been happening. So again the statistical significance of what happens at the moment needs to be carefully considered.
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