CREATE TABLE table_37339 ("Track" CLOB, "City" CLOB, "State" CLOB, "Opened" CLOB, "Major Series" CLOB, "Turns" CLOB)

What shows for opened for the Nascar Major Series?
SELECT "Opened" FROM table_37339 WHERE "Major Series" = 'nascar'
SELECT "Opened" FROM "table_37339" WHERE "Major Series" = 'nascar'