-30.93% is the change from 637 to 440
Calculation steps:
[( 440 - 637 ) ÷ 637] x 100 = -30.93%
Formula
Percentage change = [(440 - 637) / 637] x 100
Subtract the new number by the original number
440 - 637 = -197
-197 ÷ 637 = -0.3092621664050236
-0.3092621664050236 x 100 = -30.93%