query: embed.html#SELECT ?gender (str(SAMPLE(?birthyear)) AS ?year ) (COUNT(*) AS ?count)  ?geslacht WHERE {
    ?item wdt:P6379 wd:Q1782422.
    ?item wdt:P569 ?geboortedatum.
    ?item wdt:P21 ?gender.
      ?gender rdfs:label ?geslacht.
      FILTER((LANG(?geslacht)) = "nl")
  
    BIND (ROUND(YEAR(?geboortedatum)/10)*10  AS ?birthyear)
      FILTER( ?birthyear > 1800 )
      FILTER( ?birthyear < 1980 )
  
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en,en". }
  } GROUP BY ?gender ?geslacht ?birthyear 
  ORDER BY ?birthyear