-18.15% is the change from 639 to 523
Calculation steps:
[( 523 - 639 ) ÷ 639] x 100 = -18.15%
Formula
Percentage change = [(523 - 639) / 639] x 100
Subtract the new number by the original number
523 - 639 = -116
-116 ÷ 639 = -0.18153364632237873
-0.18153364632237873 x 100 = -18.15%