what is the {point in time} for {German Empire} has {population} as {4.94285e+07} ?
When did the German Empire have a population of 4.94285e+07?
SELECT ?value WHERE { wd:Q43287 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x,'4.94285e+07')) . ?s pq:P585 ?value}
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q43287> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1082> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <4.94285e+07> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

The date the German Empire had a population of 4.94285e+07