-79% is the change from 657 to 138
Calculation steps:
[( 138 - 657 ) ÷ 657] x 100 = -79%
Formula
Percentage change = [(138 - 657) / 657] x 100
Subtract the new number by the original number
138 - 657 = -519
-519 ÷ 657 = -0.7899543378995434
-0.7899543378995434 x 100 = -79%