From 1963 on, commemorative and special issues started to appear more frequently; in the 1990s, typical policy was to issue 5-6 sets per year, each consisting of 4-5 designs.
Commemorative and special issues started to appear more frequently. This was from 1963 on. Typical policy was to issue 5-6 sets per year, each consisting of 4-5 designs. This was in the 1990s.