query: #defaultView:BubbleChart
  SELECT ?country ?countryLabel (COUNT(?city) AS ?count)
  WHERE {
    ?city wdt:P31 wd:Q484170 ; wdt:P190/wdt:P17 ?country .
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en" . }
  }
  GROUP BY ?country ?countryLabel
  ORDER BY DESC(?count)