query: SELECT ?item ?population ?pointInTime WHERE {
    ?item p:P1082 [ ps:P1082 ?population; pq:P585 ?pointInTime; prov:wasDerivedFrom [ pr:P248 wd:Q21540096; pr:P854 <https://data.worldbank.org/indicator/SP.POP.TOTL>; pr:P813 '2019-04-08'^^xsd:dateTime ] ] .
  }