-22.85% is the change from 639 to 493
Calculation steps:
[( 493 - 639 ) ÷ 639] x 100 = -22.85%
Formula
Percentage change = [(493 - 639) / 639] x 100
Subtract the new number by the original number
493 - 639 = -146
-146 ÷ 639 = -0.22848200312989045
-0.22848200312989045 x 100 = -22.85%