Looking to convert income from GBP to USD.
Go to this IRS site:
https://www.irs.gov/Individuals/International-Taxpayers/Yearly-Average-Currency-Exchange-Rates
A better resource for foreign exchange rate data is the St. Louis Fed Economic Research unit -- <a rel="nofollow" target="_blank" href="https://fred.stlouisfed.org/categories/15">https://fred.stlouisfed.org/categories/15</a> -- where they provide daily, monthly, yearly exchange rates for many major currencies.