Guess the Map II: witty sequel titles failed me

I was going to post it with the index, but removed the text because I worried that might make it too easy.

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I don't even know where to begin on this one. Is it related to dates?
 
Yes, it has to do with years. (Lighter = more recent)
 
00's, 90's, 80's, 70's, 60's, 50's, 40's (or before 40s)?

Just noticing the former soviet countries appear to have been all at once, which would suggest it was on the fall of the USSR.
 
That was a tricky one. The west-coast of South America being so dark compared to the east-coast was the most interesting part. Good map!
 
Percentage of Muslims in a country?
 
Sorry about that amadeus; I went with what I could get quickly. :)

And no it's not the percentage of Muslims in a country. Though there seems to be some sort of correlation doesn't there... though why the US would be more than the UK in that case...
 
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