Question: What was the total expenditure on Materials and Supplies of the City of Toronto in 2010?
SPARQL:
 select sum(xsd:decimal(?amount)) as ?result from <http://linkedspending.aksw.org/ca-local-toronto> { ?obs qb:dataSet ls:ca-local-toronto. ?obs lso:ca-local-toronto-type "Materials and Supplies". ?obs lso:ca-local-toronto-amount ?amount. ?obs lso:refYear ?year. filter(year(?year)=2010). }