-48.25% is the change from 657 to 340
Calculation steps:
[( 340 - 657 ) ÷ 657] x 100 = -48.25%
Formula
Percentage change = [(340 - 657) / 657] x 100
Subtract the new number by the original number
340 - 657 = -317
-317 ÷ 657 = -0.4824961948249619
-0.4824961948249619 x 100 = -48.25%