CREATE TABLE table_75978 ("Rank" FLOAT, "Location" TEXT, "Total Passengers" FLOAT, "Annual change" TEXT, "Capacity" FLOAT, "Capacity in use" TEXT)

Which location has a capacity that has a rank of 23?
SELECT "Capacity in use" FROM table_75978 WHERE "Rank" = '23'
SELECT "Capacity in use" FROM "table_75978" WHERE "Rank" = '23'