what is the {point in time} for {Bernie Ecclestone} has {net worth estimate} as {2.9e+09} ?
Bernie Ecclestone had a net worth of more that 3 billion in what year?
When did Bernie Ecclestone first pass 3 billion in new worth?
SELECT ?a WHERE { ?e property:net_worth ?e . resource:Bernie_Ecclestone property:net_worth ?e . ?e property:point_in_time ?a . FILTER ( ?e = 2.9e+09 ) }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q172724> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2218> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <2.9e+09> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q172724 p:P2218 ?s . ?s ps:P2218 ?x filter(contains(?x , '2.9e+09')) . ?s pq:P585 ?value}