Question: How many schoolchildren were there in Samoa on January 1, 1991?
Paraphrase: On January 1, 1991 in Samoa how many schoolchildren were there?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q683 p:P2573 ?s . ?s ps:P2573 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1999')) }