Currently there doesn't seem to be a view on https://grafana.wikimedia.org/dashboard/db/wikidata-datamodel-statements that tracks the number of statements per datatype.
There is one that counts the number of properties by datatype.
For datatypes with just one relevant property (coordinates: P625, math: P2534, geographic shape: P3896; maybe CommonsMedia: P18), checking that usage history of that property is a suitable substitute, but not for others.