what is the {point in time} for {Oberhausen} has {population} as {209292.0} ?
The population in Oberhausen reached 209292.0 in what year?
When did Oberhausen have a population of 209292.0?
SELECT ?r WHERE { ?z property:population ?s . FILTER ( ?s = 209292.0 ) . resource:Oberhausen property:population ?z . ?z property:point_in_time ?r }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q2838> .
?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> <209292.0> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q2838 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x , '209292.0')) . ?s pq:P585 ?value}