How find out what percent of JRE's ar 1.4, 5, 6?

Does anyone know of a study or website that has info on what JRE's are really in use out there? For example, are 30% of people still on 1.4? Is 6 widely used yet? I ask because I don't want to waste my time making my app 1.4-compliant if there's pretty much no one on it anymore.
What does everyone here do?

jschell wrote:
If you want to run in 1.4 then you need to use a 1.4 compiler and VM for testing.
It is much more likely that if you develope in 1.4 that it will run in 1.5/1.6 without problems than the reverse.That's what I figured. But if 10% of java apps use 1.4 and the rest are 5 or 6, then i don't mind forcing that 10% to upgrade. But if it's 30% or more, that's a lot of people to annoy.
(But man, it would be nice to do 1.5+ collections with generics!)
Any idea if using 1.5 and using generics can reliably compile back to 1.4? Can i compile with a 1.4 flag if I've used generics?

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How find out what percent of JRE's ar 1.4, 5, 6?

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