Table: royal_canadian_mint_coins_16
Columns: year
artist
composition
mintage
issue_price

Question: What was the mintage having an issue price of $1,099.99, artist being Pamela Stagg?
SQL: SELECT AVG("mintage") FROM royal_canadian_mint_coins_16 WHERE "issue_price" = '$1,099.99' AND "artist" = 'pamela stagg'

Question: What was the year that had an issue price of $1,295.95?
SQL: SELECT AVG("year") FROM royal_canadian_mint_coins_16 WHERE "issue_price" = '$1,295.95'

Question: What was the average mintage for that of artist Celia Godkin, before the year 2010?
SQL: SELECT AVG("mintage") FROM royal_canadian_mint_coins_16 WHERE "artist" = 'celia godkin' AND "year" < 2010