Statistics on Disabled Travellers, Europe and Worldwide

As a newly created travel agency and Tour Operator dedicated to disabled travellers, I can not find any resource on statistics about this item...

Has anyone here either links or websites where I could find such statistics ??

I look for a display of disabled people in each European country, and for some figures regarding travel services offered by counterparts.

Please contact me at nicolas@marchaltravelconcept.com

Best regards !