-30.99% is the change from 639 to 441
Calculation steps:
[( 441 - 639 ) ÷ 639] x 100 = -30.99%
Formula
Percentage change = [(441 - 639) / 639] x 100
Subtract the new number by the original number
441 - 639 = -198
-198 ÷ 639 = -0.30985915492957744
-0.30985915492957744 x 100 = -30.99%