What is {population} of {Guinea} that is {point in time} is {1961-0-0} ?
In 1961, what was the population of Guinea?
What was the population of Guinea in 1961?
SELECT ?z WHERE { ?r property:population ?z . FILTER ( CONTAINS ( YEAR ( ?u ) , '1961' ) ) . ?r property:point_in_time ?u . resource:Guinea property:population ?r }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1006> .
?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> <1961-0-0>
} 

SELECT ?obj WHERE { wd:Q1006 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1961')) }