How many {number of cases} are for {malaria} ?
Malaria was reported in how many cases?
How many cases of Malaria were reported?
SELECT ( COUNT ( ?m ) AS ?a ) { resource:malaria property:number_of_cases ?m }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q12156> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1603> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q12156 wdt:P1603 ?obj }
12