Assuming that pre 1959, "Korea" meant both North and South, then yes, even North Korea at one point was "unbanned".
Only Oman has never been "unbanned" and reported on a yearbook. Every other country in the "30 other lands", at one point was "unbanned" and reported.
I now have the capability of (relatively quickly) doing world maps of the countries that reported each year. I plan to make a time-lapse of these countries from 1926 to now.