Hi David R,
I forgot to include that the above "stats" are based on the following assumptions:
1. Everyone starts from shodan
2. No one skips ranks
3. Every yudansha is issued with a certificate for every rank taken.
4. Everyone given the ranks are still living (not possible)
Cheers
David Y
PS. Only if Aikikai Hombu has an established databank assessible via the Net, then, you can put the names behind the numbers