According to the formula, on average a one-day gain or loss of 22.6 percent occurs once every 75 years.
The price of the 30-year bond had its biggest one-day gain in 14 years that day.
But merger stocks are not without quick one-day gains of their own.
The overall dollar value of the one-day gain in the stock was $173.9 million.
It was the biggest one-day gain in prices since March 18.
The announcement set off one of the biggest one-day gains ever in 30-year bond prices.
This was a record for the biggest one-day gain.
That was the biggest one-day gain for the stock since July 2001.
Coffee prices posted their largest one-day gain in more than seven years.
It was the biggest one-day gain in the index since June 2.