-17.54% is the change from 667 to 550
Calculation steps:
[( 550 - 667 ) ÷ 667] x 100 = -17.54%
Formula
Percentage change = [(550 - 667) / 667] x 100
Subtract the new number by the original number
550 - 667 = -117
-117 ÷ 667 = -0.17541229385307347
-0.17541229385307347 x 100 = -17.54%