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In recorded history, major eruptions have been about 50 years apart,[1] in 1895, 1945 and 1995-1996. Minor eruptions are frequent, with at least 60 since 1945. Some of the minor eruptions in the 1970s generated small ash falls and lahars (mudflows) that damaged skifields.

So, the last major one was around 14-15 years ago ;)

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15y ago

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