CREATE TABLE table_77208 ("Official Name" TEXT, "Status" TEXT, "Area km 2" FLOAT, "Population" FLOAT, "Census Ranking" TEXT)

What is the Area of the Allardville Parish with a Population smaller than 2,151?
SELECT SUM("Area km 2") FROM table_77208 WHERE "Official Name" = 'allardville' AND "Population" < '2,151'
SELECT SUM("Area km 2") FROM "table_77208" WHERE "Official Name" = 'allardville' AND "Population" < '2,151'