Question: What was the highest amount under the sub-account for layout and construction of buildingsin Cameroon in 2009?
SPARQL:
 select max(xsd:decimal(?amount)) as ?sum from <http://linkedspending.aksw.org/cameroon_visualisation> { ?obs qb:dataSet ls:cameroon_visualisation. ?obs lso:cameroon_visualisation-sub_account <https://openspending.org/cameroon_visualisation/sub_account/221-1>. ?obs lso:cameroon_visualisation-amount ?amount. ?obs lso:refYear ?year. filter(year(?year)=2009). }