-10.63% is the change from 621 to 555
Calculation steps:
[( 555 - 621 ) ÷ 621] x 100 = -10.63%
Formula
Percentage change = [(555 - 621) / 621] x 100
Subtract the new number by the original number
555 - 621 = -66
-66 ÷ 621 = -0.10628019323671498
-0.10628019323671498 x 100 = -10.63%