The United States Fed announced that the 2019 inflation rate was 1.9% so they had to increase their interest rate to 2.1%, while Bank of England, the central bank of England, announced that their inflation rates and interest rates were 1.7% and 1.9%, respectively, for the same period. If the exchange rate on August 1 was $ 1,56980 USD and $ 1,56340 USD on December 31, what is the theoretical exchange rate according to the International Fisher Effect theory?