-17.84% is the change from 639 to 525
Calculation steps:
[( 525 - 639 ) ÷ 639] x 100 = -17.84%
Formula
Percentage change = [(525 - 639) / 639] x 100
Subtract the new number by the original number
525 - 639 = -114
-114 ÷ 639 = -0.1784037558685446
-0.1784037558685446 x 100 = -17.84%