What is {population} of {Kiel} that is {point in time} is {2015-12-31} ?
which population of kiel on december 31st,2015?
What was the population of Kiel on December 31st, 2015?
SELECT ?f WHERE { ?r property:point_in_time ?w . resource:Kiel property:population ?r . FILTER ( CONTAINS ( YEAR ( ?w ) , '2015' ) ) . ?r property:population ?f }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1707> .
?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> <2015-12-31>
} 

SELECT ?obj WHERE { wd:Q1707 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2015')) }