What is {number of speakers} of {Esperanto} that is {point in time} is {2015-0-0} ?
How many spoke at Esperanto 2015?
How many speakers of Esperanto were there in 2015?
SELECT ?y WHERE { resource:Esperanto property:number_of_speakers ?n . FILTER ( CONTAINS ( YEAR ( ?x ) , '2015' ) ) . ?n property:point_in_time ?x . ?n property:number_of_speakers ?y }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q143> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1098> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P585> <2015-0-0>
} 

SELECT ?obj WHERE { wd:Q143 p:P1098 ?s . ?s ps:P1098 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2015')) }