What is {population} of {Tórshavn} that is {point in time} is {1991-1-1} ?
Which is the number of population of Torshavn in 1991?
What is the population of Torshavn in year 1991?
SELECT ?y WHERE { ?l property:point_in_time ?d . FILTER ( CONTAINS ( YEAR ( ?d ) , '1991' ) ) . ?l property:population ?y . resource:Tórshavn property:population ?l }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q10704> .
?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> <1991-1-1>
} 

SELECT ?obj WHERE { wd:Q10704 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1991')) }