query: SELECT ?item ?itemLabel ?begindatum ?einddatum WHERE {
    ?item wdt:P39 wd:Q64689305.
       ?item p:P39 ?statement.
       OPTIONAL {?statement pq:P580 ?begindatum.}
       OPTIONAL {?statement pq:P582 ?einddatum.}
  
    SERVICE wikibase:label { bd:serviceParam wikibase:language "nl". }
  }