The Lost Letter Ĥ

Journey through Esperanto's history to find its rarest letter.
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Corpora analyzed in the video (via Tekstaro.com):
"La batalo de l' vivo", 1891
"Homaranismo", 1906
"Fratoj Grimm", 1906
"Internacia Krestomatio", 1907
"Fabeloj de Andersen 1", 1909
"Ĉu vi kuiras ĉine?", 1976
"Ĉu li bremsis sufiĉe?", 1978
"Kien fluas roj' Castalie", 1987
"La bona lingvo", 1989
"Fajron sentas mi interne", 1990
"La Kiso", 1995
Quote by Zamenhof from "Lingvaj Respondoj", «Pri "Ĥ"» (Tekstaro.com), English translation mine.
Phonetic data from PHOIBLE:
Moran, Steven & McCloy, Daniel (eds.) 2019.
PHOIBLE 2.0.
Jena: Max Planck Institute for the Science of Human History.
(Available online at phoible.org, Accessed on 2021-10-29.)
"Majnkrafto" title graphic generated at textcraft.net.