CREATE TABLE table_13830 ("Date" FLOAT, "Ships sunk  ( Pola ) " TEXT, "Tonnage" TEXT, "U-boats destroyed  ( KuK ) " TEXT, "U-boats destroyed  ( Pola ) " TEXT)

What is the listed Tonnage for the Date of 1914?
SELECT "Tonnage" FROM table_13830 WHERE "Date" = '1914'
SELECT "Tonnage" FROM "table_13830" WHERE "Date" = '1914'