what is the {point in time} for {Rigoberta Menchú tum} has {award received} as {Nobel Peace Prize} ?
At what point in time did Rigoberta Menchu tum receive the Nobel Peace Prize?
SELECT ?value WHERE { wd:Q188620 p:P166 ?s . ?s ps:P166 wd:Q35637 . ?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/Q188620> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P166> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q35637> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

In which year did Rigoberta Menchu tum receive the Nobel Peace Prize?