US silver proof sets, 2007 trough 2011, question

I guess I'm referring to proof sets after 1964 because 1964 and before were silver. The 1976 set is 40% silver. 1992 to present are 90% silver (like the 1964 and before). The Prestige Set only has the 90% silver dollar, the rest are clad.

 

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You meant 1992 to present Silver proof sets right, as in 90% silver content? Because the regular proof sets, non-Prestige are clad only.