Seminarians in Korea

I have been looking at Vatican statistics for Korea. The Catholic population is 5,393,000 which is 10.7% of the total population of 50.2 million. There are 35 bishops in 15 dioceses, and they have 4261 priests. The most interesting figure is that there are 1884 seminarians. By my estimation this should translate into at least 250 ordinations per year, and a steadily increasing number of priests. Korea is broadly similar to England and Wales in terms of population and Catholic population, and yet it can look forward to about ten times as many ordinations each year. The Koreans must be doing something right.