query: embed.html##defaultView:BubbleChart
  SELECT ?nl (COUNT(DISTINCT ?item) as ?count) 
  {
      ?item p:P735 [ pq:P7338 [] ; ps:P735 ?value ] .
      ?item wdt:P39 wd:Q19546 .
      ?item wdt:P31 wd:Q5 . 
      ?value wdt:P1705 ?nl . 
  }
  GROUP BY ?nl
  ORDER BY DESC(?count)