-28.64% is the change from 639 to 456
Calculation steps:
[( 456 - 639 ) ÷ 639] x 100 = -28.64%
Formula
Percentage change = [(456 - 639) / 639] x 100
Subtract the new number by the original number
456 - 639 = -183
-183 ÷ 639 = -0.2863849765258216
-0.2863849765258216 x 100 = -28.64%