Question: How much was spent on food security by Cordaid in Afghanistan?
SPARQL:
 select sum(xsd:decimal(?amount)) as ?result from <http://linkedspending.aksw.org/iati_cordaid_af> { ?obs qb:dataSet ls:iati_cordaid_af. ?obs lso:iati_cordaid_af-Area "Food Security". ?obs lso:iati_cordaid_af-amount ?amount. }