-58.06% is the change from 639 to 268
Calculation steps:
[( 268 - 639 ) ÷ 639] x 100 = -58.06%
Formula
Percentage change = [(268 - 639) / 639] x 100
Subtract the new number by the original number
268 - 639 = -371
-371 ÷ 639 = -0.5805946791862285
-0.5805946791862285 x 100 = -58.06%