What is {population} of {Galicia} that is {point in time} is {2018-1-1} ?
What was the residents  of Galicia in Jan. 1st, 2018
What was the population of Galicia in Jan. 1st, 2018
SELECT ?n WHERE { ?g property:population ?n . FILTER ( CONTAINS ( YEAR ( ?s ) , '2018' ) ) . ?g property:point_in_time ?s . resource:Galicia property:population ?g }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q3908> .
?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> <2018-1-1>
} 

SELECT ?obj WHERE { wd:Q3908 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2018')) }