Table: royal_canadian_mint_coins_12
Columns: year
theme
artist
composition
mintage
issue_price

Question: What is the earliest year when the composition is 99.99% silver and the issue price is $94.95?
SQL: SELECT MIN("year") FROM royal_canadian_mint_coins_12 WHERE "composition" = '99.99% silver' AND "issue_price" = '$94.95'

Question: What year had an issue price of $94.95 and theme of Amethyst crystal?
SQL: SELECT AVG("year") FROM royal_canadian_mint_coins_12 WHERE "issue_price" = '$94.95' AND "theme" = 'amethyst crystal'