Edo de Roo produced some stats showing the number of statements on items that have a Wikipedia article in Dutch.
I like his approach; it shows how well Wikidata might serve a Wikipedia. It may infer how well subjects that relate to the Netherlands are supported on other Wikipedias as well. There is more about subjects related to the Netherlands than what you find only on the Dutch Wikipedia but that is a bit more complicated.
When you compare these numbers to Magnus's stats, it is not bad at all. Most items for all of of Wikidata have 1 statement (4,474,865 23.22%) and for the Dutch it is 6 statements (36078).
Obviously there is room for growth.