I wasn't able to find a link but I do have a quote:
From Edward Wallerstein's "Circumcision: An American Health Fallacy" . Pg 128
"First of all, for a man who was not circumcised as an infant the chances of
him having to get circumcised as a adult are extremely rare. In fact it's
only 6 in 100,000. (0.006%)
Health officials of each Scandinavian country were queried about adult
circumcision.. None of the health officials could provide precise data,
because the numbers were so small that they weren't worth compiling. Each
official stressed that foreskin problems were present but said they were
largely treated medically-surgical solutions were extremely rare.
"in Oslo, Norway, over a 26-year period in which 20,000 male babies were
cared for, 3 circumcisions were performed-a frequency rate of 0.02%.
In Denmark. 1968 children up to the age of 17 were examined over a period
of several years. In this group, 3 circumcisions were performed-a frequency
of 0.15%. In this study, in retrospect, the physicians believed that all
three operations might have been avoided. Both of these studies related to
the infrequency of circumcision and puberty, they did not deal with the
issue in adulthood."
I hope that gives you the information you needed. I know of no other information of the incidence of medically necessary circumcision in adulthood. I do know that there are a very few circumcisions that are performed on older men who are diabetic where the condition has caused phimosis. This is very rare but I have no statistics. Most problems with the foreskin are either so insignificant or so rare that detailed records are not kept.
Frank