What is {population} of {Portland} that is {point in time} is {2010-0-0} ?
What was the population of Portland in 2010.
In 2010, what was the population of Portland?
SELECT ?e WHERE { resource:Portland property:population ?r . ?r property:population ?e . ?r property:point_in_time ?o . FILTER ( CONTAINS ( YEAR ( ?o ) , '2010' ) ) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q6106> .
?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> ?obj .
?statement <http://www.wikidata.org/entity/P585> <2010-0-0>
} 

SELECT ?obj WHERE { wd:Q6106 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2010')) }