-23.47% is the change from 639 to 489
Calculation steps:
[( 489 - 639 ) ÷ 639] x 100 = -23.47%
Formula
Percentage change = [(489 - 639) / 639] x 100
Subtract the new number by the original number
489 - 639 = -150
-150 ÷ 639 = -0.2347417840375587
-0.2347417840375587 x 100 = -23.47%