what is the {end time} for {La Vanguardia} has {manager/director} as {Luis Martínez de Galinsoga y de la Serna} ?
When did Luis Martinez de Galinsoga y de la Serna end his time as manager of La Vanguardia?
SELECT ?value WHERE { wd:Q511533 p:P1037 ?s . ?s ps:P1037 wd:Q11689899 . ?s pq:P582 ?value}
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q511533> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1037> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q11689899> .
?statement <http://www.wikidata.org/entity/P582> ?value. 
} 

When did Luis quit his manager job at La Vanguardia?