query: # number of demonstrations per country (but lots of missing or insufficiently linked data)
  SELECT ?country ?countryLabel (COUNT(DISTINCT ?demo) AS ?count) WHERE {
    ?demo wdt:P31/wdt:P279* wd:Q175331;
          wdt:P17 ?country.
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
  }
  GROUP BY ?country ?countryLabel
  ORDER BY DESC(?count)