Question: What was the population of Hanoi in 2015?
Paraphrase: How many people were citizens of Hanoi in the year 2015?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q1858 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2015')) }