-17.71% is the change from 621 to 511
Calculation steps:
[( 511 - 621 ) ÷ 621] x 100 = -17.71%
Formula
Percentage change = [(511 - 621) / 621] x 100
Subtract the new number by the original number
511 - 621 = -110
-110 ÷ 621 = -0.17713365539452497
-0.17713365539452497 x 100 = -17.71%