Question: What is the highest single budget amount in the city of Springfield for public safety?
SPARQL:
 select max(xsd:decimal(?amount)) from <http://linkedspending.aksw.org/city-of-springfield-budget> { ?obs qb:dataSet ls:city-of-springfield-budget. ?obs lso:city-of-springfield-budget-deptgroup <https://openspending.org/city-of-springfield-budget/deptgroup/public-safety>. ?obs lso:city-of-springfield-budget-amount ?amount. }