CREATE TABLE table_25054 ("African rank" FLOAT, "World rank" FLOAT, "Nation" TEXT, "GDP per capita" TEXT, "Total GDP world rank" FLOAT)

How many items were listed under world rank under the nation of Nigeria?
SELECT COUNT("World rank") FROM table_25054 WHERE "Nation" = 'Nigeria'
SELECT COUNT("World rank") FROM "table_25054" WHERE "Nation" = 'Nigeria'