Question: What was the frontex staff budget in 2005?
SPARQL:
 select sum(xsd:decimal(?amount)) as ?result from <http://linkedspending.aksw.org/frontex> { ?obs lso:refYear ?year. filter(year(?year)=2005). ?obs qb:dataSet ls:frontex. ?obs lso:frontex-Heading <https://openspending.org/frontex/Heading/a-1>. ?obs lso:frontex-amount ?amount. }