-11.43% is the change from 621 to 550
Calculation steps:
[( 550 - 621 ) ÷ 621] x 100 = -11.43%
Formula
Percentage change = [(550 - 621) / 621] x 100
Subtract the new number by the original number
550 - 621 = -71
-71 ÷ 621 = -0.1143317230273752
-0.1143317230273752 x 100 = -11.43%