No tracker_sparql_connection_statistics()/statistics_async()/statistics_finish()

It is possible to query statistics through SPARQL. This query would provide a similar return value than the statistics API:

SELECT
  ?class
  (COUNT(?resource) AS ?count)
{
  ?class a rdfs:Class .
  ?resource a ?class
}
GROUP BY ?class
ORDER BY DESC ?count
    

But of course, other more detailed statistics may be obtained.