What is {population} of {Tours} that is {point in time} is {2013-1-1} ?
Number of people on tour Jan 2013?
How many people where on Tour at 2013-1-1?
SELECT ?e WHERE { resource:Tours property:population ?c . ?c property:point_in_time ?h . ?c property:population ?e . FILTER ( CONTAINS ( YEAR ( ?h ) , '2013' ) ) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q288> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1082> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P585> <2013-1-1>
} 

SELECT ?obj WHERE { wd:Q288 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2013')) }