-97.11% is the change from 657 to 19
Calculation steps:
[( 19 - 657 ) ÷ 657] x 100 = -97.11%
Formula
Percentage change = [(19 - 657) / 657] x 100
Subtract the new number by the original number
19 - 657 = -638
-638 ÷ 657 = -0.9710806697108066
-0.9710806697108066 x 100 = -97.11%