Question: Since 2020, the number of COVID - 19 deaths in the United States has risen sharply. What is the year - on - year percentage increase in the total market value of Pfizer Inc. (PFE) on the last trading day of 2021 compared with that on the last trading day of 2020? The result should be rounded to two decimal places, and the unit of the total market value should be in "hundred million US dollars" during the calculation process.
Answer: The year-on-year increase is 61.95%.
Scoring points: The values of the total market capitalization on the last trading days of the two years should be consistent. 
Rounding errors are allowed.
Category: Complex_Historical_Investigation(Global)