-13.77% is the change from 639 to 551
Calculation steps:
[( 551 - 639 ) ÷ 639] x 100 = -13.77%
Formula
Percentage change = [(551 - 639) / 639] x 100
Subtract the new number by the original number
551 - 639 = -88
-88 ÷ 639 = -0.13771517996870108
-0.13771517996870108 x 100 = -13.77%