-12.84% is the change from 631 to 550
Calculation steps:
[( 550 - 631 ) ÷ 631] x 100 = -12.84%
Formula
Percentage change = [(550 - 631) / 631] x 100
Subtract the new number by the original number
550 - 631 = -81
-81 ÷ 631 = -0.12836767036450078
-0.12836767036450078 x 100 = -12.84%