I try help with some data let's start with
Poland
First six Helicopters Mi-14PŁ arrived in 1981 no month mentioned
in 1983 next six and in 1984 four in variant Mi-14PS. Two were lost so in 1990 two additional used ones were buy from Soviet Union. Around 2000-2005 Polish Mi-14 both variants were modernised to Mi-14PŁMK with new torpedo's overhaul of avionics and new system for fights with submarines. First they were plans to retried them in 2017-2018 but they serve until September 2025.
DDR
First nine Mi-14PŁ delivered in years 1979-1981. then six Mi-14BT in 1984 after unification with west the serve briefly in Bundeswehr 14 machines on lost earlier in DDR times. They were retried in end of 1991. Two sold to USA in 1993 rest to museums.
Libya
To Libya were delivered 36 machines in variant Mi-14PŁ don't know date but must be after 1975 when this helicopters were introduced in USSR. Probably in the same time like in DDR? They were still in usage in 2007
https://www.airhistory.net/photo/518035/LC1413
Bulgaria
Introduced in 1979 and probably still in usage or like in Poland just retried page with Bulgarian Mi-14 data
https://www.aeroflight.co.uk/waf/bul...g-nv2-home.htm