The graph below shows the history of coffee quotations, in 1977 we had the highest price. In green the nominal prices and in red the prices corrected by the American inflation.
*Highest nominal value of the series:
US$ 3.3750 quotation of April 14, 1977*
*
Highest corrected index value (CPI - Consumer Price Index) for October 08, 2021 of the series:
US$ 15.4961 quotation of April 14, 1977 (nominal US$ 3.3750)*.