-21.16% is the change from 657 to 518
Calculation steps:
[( 518 - 657 ) ÷ 657] x 100 = -21.16%
Formula
Percentage change = [(518 - 657) / 657] x 100
Subtract the new number by the original number
518 - 657 = -139
-139 ÷ 657 = -0.2115677321156773
-0.2115677321156773 x 100 = -21.16%