It's also interesting that while the numbers of atheists and agnostics HAVE increased, the vast majority of growth for the "Unaffiliated" category comes from those who are not affiliated with an organized faith but also are not atheists (presumably with a faith in some higher power but no religion).
As RINO Tom pointed out, though, let's not confuse "Unaffiliated" with being an atheist, or even an agnostic.
"Nothing in particular" could be a great many things, including a form of atheism and agnosticism. I describe myself as 'apatheist', for example.
