Considering I had to look up who two of these were, I'd say that the likelihood is that those were less famous than Bowie, Prince and Rickman. The other issue you'll find is that while there were a goodly Entertainment deaths in 2015, few had a wide name recognition, whereas in 2016 there have been near a dozen very well known names pass on, many of then quite young, being in just their 50's or 60's. I don't recall anyone talking about how horrific 2015 had been on entertainers, but virtually everyone I see is commenting on 2016, which would also indicate a lot of the bigger names, including some of the biggest died this year.