CREATE TABLE table_54150 ("Year" FLOAT, "Artist" TEXT, "Composition" TEXT, "Mintage" FLOAT, "Issue Price" TEXT)

What was the average mintage for that of artist Celia Godkin, before the year 2010?
SELECT AVG("Mintage") FROM table_54150 WHERE "Artist" = 'celia godkin' AND "Year" < '2010'
SELECT AVG("Mintage") FROM "table_54150" WHERE "Artist" = 'celia godkin' AND "Year" < '2010'