query: #defaultView:BubbleChart
  SELECT ?cid ?firstname (COUNT(*) AS ?count) WHERE {
    ?pid wdt:P19 ?pob .
    ?pob wdt:P17 wd:Q408 .
  
    ?pid wdt:P735 ?cid.
    OPTIONAL {
      ?cid rdfs:label ?firstname 
      FILTER((LANG(?firstname)) = "en")
    }
  }
  GROUP BY ?cid ?firstname
  ORDER BY DESC(?count) ?firstname
  LIMIT 500