Table schema:
CREATE TABLE table_name_16 (population__2010_census_ INTEGER, administrative_division VARCHAR, area__km²_ VARCHAR)

Question: What was the sum of the population in 2010 for the division of japeri with an area of 82.9 squared km?
SQL: SELECT SUM(population__2010_census_) FROM table_name_16 WHERE administrative_division = "japeri" AND area__km²_ < 82.9