-28.95% is the change from 639 to 454
Calculation steps:
[( 454 - 639 ) ÷ 639] x 100 = -28.95%
Formula
Percentage change = [(454 - 639) / 639] x 100
Subtract the new number by the original number
454 - 639 = -185
-185 ÷ 639 = -0.2895148669796557
-0.2895148669796557 x 100 = -28.95%