what is the {point in time} for {Equatorial Guinea} has {total reserves} as {2.90684e+09} ?
In what year did Equatorial Guinea have reserves of 2.90684e+09?
When did Equatorial Guinea have reserves of 2.90684e+09?
SELECT ?b WHERE { ?a property:total_reserves ?w . resource:Equatorial_Guinea property:total_reserves ?a . ?a property:point_in_time ?b . FILTER ( ?w = 2.90684e+09 ) }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q983> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2134> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <2.90684e+09> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q983 p:P2134 ?s . ?s ps:P2134 ?x filter(contains(?x , '2.90684e+09')) . ?s pq:P585 ?value}