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pop 77These are the Billboard Hot 100 number-one hits of 1977. That year, 18 acts earned their first number one songs, such as Leo Sayer, Rose Royce, Mary MacGregor, Manfred Mann's EarthCountries in the world by population (2025) ; 77, Rwanda, 14,569,341 ; 78, Burundi, 14,390,003 ; 79, Bolivia, 12,581,843 ; 80, Tunisia, 12,348,573