query: embed.html##Number of out of school children by continent since 1999
  #defaultView:BarChart
  SELECT (STR(YEAR(?date)) AS ?year) ?number_of_out_of_school_chidren ?continent ?continentLabel WHERE {
    ?continent wdt:P31 wd:Q5107 .
    ?continent p:P2573 [
      ps:P2573 ?number_of_out_of_school_chidren ;
      pq:P585 ?date ;
    ]
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
    
  }