-21% is the change from 657 to 519
Calculation steps:
[( 519 - 657 ) ÷ 657] x 100 = -21%
Formula
Percentage change = [(519 - 657) / 657] x 100
Subtract the new number by the original number
519 - 657 = -138
-138 ÷ 657 = -0.2100456621004566
-0.2100456621004566 x 100 = -21%