In which country did the dance "Letkajenkka" originate?

Letkajenkka, also known as Letkajenka in English and many other languages, is a Finnish dance.

The steps of Letkajenkka are like the steps of Bunny Hop, a novelty dance from the 1950s. It has been proposed that exchange students returning from the United States to Finland would have imported the steps of the Bunny Hop to Finland, as they had seen them on the TV show Bandstand. Whereas the Bunny Hop starts with a right foot lead, the Letkajenkka / letkajenkka transformed into a dance based on the same step but starting with a left leg lead. This can be seen from the early recordings for TV and in some movies made during the hottest craze. Also, many translated lyrics include advice on the steps: "left kick, left kick, right kick, right kick, forward jump, backward jump, hop, hop, hop".