Table schema:
CREATE TABLE table_name_15 (pop__2004_ INTEGER, governorate VARCHAR, area_km² VARCHAR)

Question: Count the sum of Pop (2004) which has a Governorate of al mahrah with an Area km² smaller than 78,073?
SQL: SELECT SUM(pop__2004_) FROM table_name_15 WHERE governorate = "al mahrah" AND area_km² < 78 OFFSET 073