what is the {point in time} for {Norway} has {number of out of school children} as {20602.0} ?
What year did Norway have a 20,602 children not enrolled in school?
SELECT ?value WHERE { wd:Q20 p:P2573 ?s . ?s ps:P2573 ?x filter(contains(?x,'20602.0')) . ?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/Q20> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2573> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <20602.0> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

What year was it that Norway didn't have 20,602 children enrolled in school?