query: SELECT ?carica ?caricaLabel ?caricaDescription (COUNT(?item) as ?uses)
  WHERE {
    ?item p:P39 ?statement .
    ?statement ps:P39 ?carica. 
    ?carica wdt:P279* wd:Q3858501 .
    
    OPTIONAL{?statement pq:P5054 ?governo .}
    OPTIONAL{?statement pq:P580 ?inizio .}
    OPTIONAL{?statement pq:P582 ?fine .}
    OPTIONAL{?statement pq:P2868 ?ruolo .}
    OPTIONAL{?statement pq:P748 ?designato .}
    SERVICE wikibase:label { bd:serviceParam wikibase:language "it". }
  }
  GROUP BY ?carica ?caricaLabel ?caricaDescription
  ORDER BY DESC (?uses)