Release: Transitional Euro Country Exchange Rates
Averages of daily figures. Noon buying rates in New York City for cable transfers payable in foreign currencies. Starting January 1999 derived using the official fixed euro conversion rates.
Federal Reserve Bank of St. Louis, Portugal / U.S. Foreign Exchange Rate (DISCONTINUED) [EXPOUS], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/EXPOUS, December 16, 2018.