what is the {determination method} for {Gijón} has {population} as {277559.0} ?
How was the population of Gijon determined to be 277559?
SELECT ?value WHERE { wd:Q12273 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x,'277559.0')) . ?s pq:P459 ?value}
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q12273> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1082> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <277559.0> .
?statement <http://www.wikidata.org/entity/P459> ?value. 
} 

Tell me how the population of Gijon was calculated to be 277559.