what year did the U.S. mint start minting silver proof coin sets?

Silver Eagle Proof Coins Ending Soon on eBay:
LARGE ESTATE LOT SALE~PROOF QUARTER SET~MINT COINS~GOLD~SILVER~WWII~ANCIENT E2

US $76.00 (16 Bids) End Date: Monday May-21-2012 22:32:29 PDT Bid now | Add to watch list

• eBay Ending Soon:

  2012-W Proof American Silver Eagle $1 NGC PF70 PF-70 Ultra Cameo Early Releases $109.00 28d 16h 55m

  2006-P 20TH ANNIVERSARY REVERSE PROOF SILVER EAGLE NGC PF69-BLACK LABEL BEAUTY! $217.50 21h 58m

  ★ 2006-P NGC REVERSE PROOF PF69 AMERICAN SILVER EAGLE U.S. COINS ★ $173.50 23h 52m

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