what is the {point in time} for {Belgium} has {population} as {11150516} ?
When did Belgium have a population of 11,150,516?
SELECT ?value WHERE { wd:Q31 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x,'11150516')) . ?s pq:P585 ?value}
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q31> .
?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> <11150516> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

In what year was Belgium's population 11,150,516?