query: # most common years of birth in Wikidata
  SELECT ?yearOfBirth (SUM(?count) AS ?total) WHERE {
    {
      SELECT ?dateOfBirth (COUNT(?item) AS ?count) WHERE {
        VALUES ?precision { "9"^^xsd:integer "10"^^xsd:integer "11"^^xsd:integer }
        ?item wdt:P31 wd:Q5;
              p:P569/psv:P569 [
                wikibase:timeValue ?dateOfBirth;
                wikibase:timePrecision ?precision
              ].
      }
      GROUP BY ?dateOfBirth
    }
    BIND(YEAR(?dateOfBirth) AS ?yearOfBirth)
  }
  GROUP BY ?yearOfBirth
  ORDER BY DESC(?total)
  LIMIT 100