-87.82% is the change from 657 to 80
Calculation steps:
[( 80 - 657 ) ÷ 657] x 100 = -87.82%
Formula
Percentage change = [(80 - 657) / 657] x 100
Subtract the new number by the original number
80 - 657 = -577
-577 ÷ 657 = -0.878234398782344
-0.878234398782344 x 100 = -87.82%