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modern proof set background colors

decided to organize my modern proof sets by year. Question I have is where can I find a listing on the background colors for clad & proof sets. from 1992 to present ?
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Black 1968-1972, 1983
Red 1973-1982
Purple 1984-1993
Green 1994-1998
Thank you for this. What about to the present ? Also the silver ?
ttt
The modern silver sets have a black background.