For data not available from the World Bank Official Exchange Rate, annual average exchange rates are obtained from the CIA World Factbook
A 25:1 rate was used to convert Cuban pesos into Cuban convertible pesos see link:.
The 8.75 exchange rate listed by the World Bank for El Salvador refers to the Salvadoran colón, which is no longer in circulation and has been replaced by the US dollar. Thus, the exchange rate used here is 1.