If you’re wondering how to compare currencies then Factiva (Portal > Library > E-Library > Factiva) will provide you with some answers:
Go to Companies / Markets and choose currencies. Then choose from the drop-down menus the currencies you want to compare. You can obtain the current quote or the historical quote, daily, weekly or monthly price, and choose the date range (anything up to 2 yrs) then ‘get quote’.
Results are shown in a spreadsheet or (scroll to the bottom of the screen) in an interactive chart. I compared daily prices between the US dollar with the Belize Dollarper for the past three months: