CREATE TABLE table_name_75 (mintage INT, artist VARCHAR, year VARCHAR)

What was the average mintage for that of artist Celia Godkin, before the year 2010?
SELECT AVG(mintage) FROM table_name_75 WHERE artist = "celia godkin" AND year < 2010
SELECT AVG("mintage") FROM "table_name_75" WHERE "artist" = "celia godkin" AND "year" < 2010