-80.66% is the change from 636 to 123
Calculation steps:
[( 123 - 636 ) ÷ 636] x 100 = -80.66%
Formula
Percentage change = [(123 - 636) / 636] x 100
Subtract the new number by the original number
123 - 636 = -513
-513 ÷ 636 = -0.8066037735849056
-0.8066037735849056 x 100 = -80.66%