CREATE TABLE table_72693 ("Date" CLOB, "Cover model" CLOB, "Centerfold model" CLOB, "Interview subject" CLOB, "20 Questions" CLOB, "Pictorials" CLOB)

When was Kalin Olson listed as the centerfold model?
SELECT "Date" FROM table_72693 WHERE "Centerfold model" = 'Kalin Olson'
SELECT "Date" FROM "table_72693" WHERE "Centerfold model" = 'Kalin Olson'