query: embed.html##Number of out of school children in the world since 1999
  #defaultView:LineChart
  SELECT (STR(YEAR(?date)) AS ?year) ?number_of_out_of_school_chidren ?countryLabel WHERE {
    wd:Q2 p:P2573 ?out_of_school_chidren.
    ?out_of_school_chidren ps:P2573 ?number_of_out_of_school_chidren.
    ?out_of_school_chidren pq:P585 ?date.
    #?out_of_school_chidren pq:P459 ?method.
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }