How many {manufacturer} are to/by {BHP Billiton} ?
BHP Billiton is the manufacturer for how many?
SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P176 wd:Q625713 }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P176> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q625713 .
} 

BHP Biliton manufactures how many of these?