What is {population} of {Yemen} that is {point in time} is {1994-0-0} ?
In 1994, what was Yemen's population?
What is the population of Yemen in the year 1994?
SELECT ?u WHERE { FILTER ( CONTAINS ( YEAR ( ?h ) , '1994' ) ) . ?o property:point_in_time ?h . ?o property:population ?u . resource:Yemen property:population ?o }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q805> .
?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> <1994-0-0>
} 

SELECT ?obj WHERE { wd:Q805 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1994')) }