https://en.wikipedia.org/wiki/Early_1980s_recession#Inflatio...
http://www.usinflationcalculator.com/inflation/historical-in... lists a peak of 14.8% but if have seen 17% elsewhere.
1917-1920 had some periods over 20%.
https://en.wikipedia.org/wiki/Early_1980s_recession#Inflatio...