Yields the population sum of the given countries.
{{
Countries population|country1|country2|...|country39}}
{{
Countries population|CHN|JPN|IND|PAK|BGD|IDN}}
→ 3,703,082,601{{
Countries population|Afghanistan|Bahrain|Bangladesh|Bhutan|Brunei|Cambodia}}
→ 236,434,347Yields the population sum of the given countries.
{{
Countries population|country1|country2|...|country39}}
{{
Countries population|CHN|JPN|IND|PAK|BGD|IDN}}
→ 3,703,082,601{{
Countries population|Afghanistan|Bahrain|Bangladesh|Bhutan|Brunei|Cambodia}}
→ 236,434,347