Data like
3 members, 25 miles
47 members, 26-50 miles
33 members 51-100 miles
Or whatever distance breakdown makes sense with your data set
I understand that some percentage from Europe and Japan has been marching since the late 70's, however, I would think it is less than 5% of any one corps (w/ exception of Yamato (or whoever that is that has camps in Japan and CA and merges it together in June))