With a growing portfolio of oil fields and refineries, Sun opened its first service station in Ardmore, Pennsylvania in 1920. In 1922, it changed its name back to Sun Oil Company and, in 1925, it became a public company via an initial public offering on the New York Stock Exchange. Sunoco ranked 39th among United States corporations in the value of World War II production contracts. Sun expanded internationally following the war. Its first Canadian refinery was built in 1953 in Sarnia, Ontario, home to a burgeoning new petrochemical industry. Sun established a facility at Venezuela's Lake Maracaibo in 1957, which produced over a billion barrels (160,000,000 m3) before the operation was nationalized in 1975.