-32.97% is the change from 637 to 427
Calculation steps:
[( 427 - 637 ) ÷ 637] x 100 = -32.97%
Formula
Percentage change = [(427 - 637) / 637] x 100
Subtract the new number by the original number
427 - 637 = -210
-210 ÷ 637 = -0.32967032967032966
-0.32967032967032966 x 100 = -32.97%