I too was just thinking it's been a bad year and only April. It's got me worried, not about me either.
This was recently discussed on R4's More or Less.
Their answer was: Yes more slebs are dying this year than ever before.
Reason? Before the mid 60s and the mass ownership of televisions, there were very few real slebs. A handful of film stars and entertainers, a couple of politicians, very few sports people.
The first mass entertainment slebs are now of that age when we can expect them to be popping off. This does not include Wood, who has simply died young.
As the number of famous people has increased, we can expect ever increasing sleb deaths.
Explained much better if you listen to their cast.(17th April)