query: SELECT ?q ?qLabel ?items {
   {
   SELECT ?q (COUNT(DISTINCT(?item)) AS ?items) {
   ?item p:P528 ?s .
   ?s ps:P528 ?z .
   ?s pq:P972 ?q .
  	}
  	group by ?q}
  
   SERVICE wikibase:label {
   bd:serviceParam wikibase:language "en" .
   }
  }
  ORDER BY DESC(?items)