query: embed.html##defaultView:LineChart
  SELECT (STR(YEAR(?date)) AS ?year) ?number_of_out_of_school_chidren ?placesLabel (STR(?refUrl) as ?source) WHERE {
    VALUES ?places {wd:Q30 wd:Q142 wd:Q145} .
    ?places p:P2573 [
      ps:P2573 ?number_of_out_of_school_chidren ;
      pq:P585 ?date ;
      prov:wasDerivedFrom [ pr:P854 ?refUrl ]
      ]
  
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }