Two Short Years

关于此套币: An incredibly short series only being struck 2 years; 1982 and 1984 with 1983 having been reportedly minted in early catalogues, but for some reason, never produced? I've never been able to find out if they were in fact produced in 1983 and then destroyed or if not minted at all, what was the reason they stopped the series then again restarted it in 1984?