query: SELECT ?object ?objectLabel (COUNT(?item) AS ?count) 
  WHERE 
  {
    ?item wdt:P361 wd:Q13915.
    ?item wdt:P180 ?object .
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  } GROUP BY ?object ?objectLabel
  ORDER BY DESC(?count)