Currently, there are 113761 triples with predicate http://wikiba.se/ontology-beta#quantityAmount on query.wikidata.org, which presumably should be http://wikiba.se/ontology#quantityAmount (wikibase:quantityAmount). This query counts them:
SELECT (SUM(?notBeta) AS ?countNotBeta) (SUM(?beta) AS ?countBeta) WHERE {
{
[] <http://wikiba.se/ontology#quantityAmount> [].
BIND(1 AS ?notBeta).
} UNION {
[] <http://wikiba.se/ontology-beta#quantityAmount> [].
BIND(1 AS ?beta).
}
}Link; current results: 394040, 113761.
I found them in a query related to normalized units (see tweet), but it seems not quite all full value nodes which have such a beta triple are reachable via psn: triples:
SELECT (SUM(?beta) AS ?countBeta) (SUM(?psnBeta) AS ?countPsnBeta) WHERE {
?node <http://wikiba.se/ontology-beta#quantityAmount> [].
BIND(1 AS ?beta).
OPTIONAL {
?property a wikibase:Property;
wikibase:statementValueNormalized ?psn.
[] ?psn ?node.
BIND(1 AS ?psnBeta).
}
}Link; current results: 406484, 402826.
(Though there might be something wrong with that last query, because ?countBeta is much higher than in the first query. Are value nodes reused that much?)