Table: mint_coins_2000s
Columns: year
artist
mintage_proof
issue_price_proof
mintage_bu_clarification_needed
issue_price_bu_clarification_needed

Question: What's listed as the Issue Price (BU) [Clarification Needed] with a Mintage (Proof) of 29,586?
SQL: SELECT "issue_price_bu_clarification_needed" FROM mint_coins_2000s WHERE "mintage_proof" = '29,586'

Question: Who is the Artist with an Issue Price (BU) [Clarification Needed] of n/a along with  a Year larger than 2004, and Mintage (Proof) of 25,000?
SQL: SELECT "artist" FROM mint_coins_2000s WHERE "issue_price_bu_clarification_needed" = 'n/a' AND "year" > 2004 AND "mintage_proof" = '25,000'

Question: What's the average Year with an Issue Price (Proof) of $49.95, and Artist of W.H.J. Blakemore?
SQL: SELECT AVG("year") FROM mint_coins_2000s WHERE "issue_price_proof" = '$49.95' AND "artist" = 'w.h.j. blakemore'

Question: What's the Issue Price (BU) [Clarification Needed] with a Year larger than 2002 and Mintage (Proof) of 50,000?
SQL: SELECT "issue_price_bu_clarification_needed" FROM mint_coins_2000s WHERE "year" > 2002 AND "mintage_proof" = '50,000'