-36.07% is the change from 657 to 420
Calculation steps:
[( 420 - 657 ) ÷ 657] x 100 = -36.07%
Formula
Percentage change = [(420 - 657) / 657] x 100
Subtract the new number by the original number
420 - 657 = -237
-237 ÷ 657 = -0.3607305936073059
-0.3607305936073059 x 100 = -36.07%