-12.85% is the change from 638 to 556
Calculation steps:
[( 556 - 638 ) ÷ 638] x 100 = -12.85%
Formula
Percentage change = [(556 - 638) / 638] x 100
Subtract the new number by the original number
556 - 638 = -82
-82 ÷ 638 = -0.12852664576802508
-0.12852664576802508 x 100 = -12.85%