What is {population} of {Laos} that is {point in time} is {1960-0-0} ?
What was the population of Laos in 1960?
In 1960 what was the population of Laos?
SELECT ?r WHERE { FILTER ( CONTAINS ( YEAR ( ?z ) , '1960' ) ) . ?r property:point_in_time ?z . ?r property:population ?r . resource:Laos property:population ?r }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q819> .
?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> <1960-0-0>
} 

SELECT ?obj WHERE { wd:Q819 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1960')) }