what is the {point in time} for {Istanbul} has {population} as {14657434} ?
On what date did Istanbul have a population of 14657434?
When did Istanbul have a population of 14657434?
SELECT ?p WHERE { ?c property:point_in_time ?p . FILTER ( CONTAINS ( ?u , '14657434' ) ) . ?c property:population ?u . resource:Istanbul property:population ?c }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q406> .
?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> <14657434> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q406 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x , '14657434')) . ?s pq:P585 ?value}