EUR - USD FX (foreign exchange rate) since EUROs do exist. ECB fixation
origin <a href="https://de.wikipedia.org/wiki/Benutzer:Thire" class="extiw" title="de:Benutzer:Thire">Thomas Steiner</a>
CC BY-SA 2.5
data from ECB EURUSD fixing <a rel="nofollow" class="external autonumber" href="https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/eurofxref-graph-usd.en.html">[1]</a>, as of 25.10.2020. created with GNU R, see source below;