-12.42% is the change from 628 to 550
Calculation steps:
[( 550 - 628 ) ÷ 628] x 100 = -12.42%
Formula
Percentage change = [(550 - 628) / 628] x 100
Subtract the new number by the original number
550 - 628 = -78
-78 ÷ 628 = -0.12420382165605096
-0.12420382165605096 x 100 = -12.42%