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

Silver Eagle Proof Coins Ending Soon on eBay:
1990 P Eisenhower Ike Silver Commemorative Dollar PR69DCAM PCGS Proof Coin PR 69

US $43.95 (1 Bid) End Date: Tuesday May-22-2012 16:42:52 PDT Bid now | Add to watch list

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  A LOT OF THREE PROOF SILVER AMERICAN EAGLE 1999 ~ 2001 COMPLETE WITH OGP AND COA $150.09 1h 4m

  2012-W Proof American Silver Eagle $1 NGC PF70 PF-70 Ultra Cameo Early Releases $109.00 27d 22h 37m

  2006-P 20TH ANNIVERSARY REVERSE PROOF SILVER EAGLE NGC PF69-BLACK LABEL BEAUTY! $217.50 3h 40m

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