DCStamps - very useful charts, congatulations. I hope you will add new ones soonest possible.
I wonder what will nigelc say on your Crete one. I miss the German occupation there.
Slowly but surely I am doing new ones. I just added the one for Russian Central Asia and Mongolia last week.
The next one will probably be in the Balkins (and may have to be two charts, pre and post WW1)
Also, regarding Crete, by the time of WW2, they were fully integrated into Greece, Crete was no longer considered an individual "country." The charts are meant to understand the movement of individual countries, not all of their various regions.