-97.01% is the change from 636 to 19
Calculation steps:
[( 19 - 636 ) ÷ 636] x 100 = -97.01%
Formula
Percentage change = [(19 - 636) / 636] x 100
Subtract the new number by the original number
19 - 636 = -617
-617 ÷ 636 = -0.970125786163522
-0.970125786163522 x 100 = -97.01%