From January 2010 to April 2025, in which month did the S&P 500 index experience the largest single-month increase? What was the percentage increase that month? (Unit: %, rounded to two decimal places)

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Summary:
We retrieved the monthly closing prices for the SPDR S&P 500 ETF (SPY), which is a widely used proxy for the S&P 500 index, covering January 2010 through April 2025 . By calculating the month-over-month percentage change for each month and locating the maximum value, we identified that April 2020 posted the largest single-month gain, with SPY rising 12.70 %.