-30.36% is the change from 639 to 445
Calculation steps:
[( 445 - 639 ) ÷ 639] x 100 = -30.36%
Formula
Percentage change = [(445 - 639) / 639] x 100
Subtract the new number by the original number
445 - 639 = -194
-194 ÷ 639 = -0.30359937402190923
-0.30359937402190923 x 100 = -30.36%