Question: when did Mannheim population rise to 305741.0?
Paraphrase: At what point did the population of Mannheim reach 305741.0?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q2119 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x , '305741.0')) . ?s pq:P585 ?value}