-30.99% is the change from 923 to 637
Calculation steps:
[( 637 - 923 ) ÷ 923] x 100 = -30.99%
Formula
Percentage change = [(637 - 923) / 923] x 100
Subtract the new number by the original number
637 - 923 = -286
-286 ÷ 923 = -0.30985915492957744
-0.30985915492957744 x 100 = -30.99%