The government funding of graduate medical education is not increasing, thus the number of residency slot openings are not increasing at the same pace, as graduating medical students (particularly DO, where the class size is larger, and we have had an explosion of new schools, and more to come).
In addition, There are lots of carribean schools where the students do their clinical rotations (3rd and 4th year) in inner city hospitals who are getting placed in those residencies , which is again reducing the pool of available residency openings.
Thus, the challenge for international medical graduates to get residency will continue to get more challenging,