-37.05% is the change from 637 to 401
Calculation steps:
[( 401 - 637 ) ÷ 637] x 100 = -37.05%
Formula
Percentage change = [(401 - 637) / 637] x 100
Subtract the new number by the original number
401 - 637 = -236
-236 ÷ 637 = -0.3704866562009419
-0.3704866562009419 x 100 = -37.05%