-13.04% is the change from 621 to 540
Calculation steps:
[( 540 - 621 ) ÷ 621] x 100 = -13.04%
Formula
Percentage change = [(540 - 621) / 621] x 100
Subtract the new number by the original number
540 - 621 = -81
-81 ÷ 621 = -0.13043478260869565
-0.13043478260869565 x 100 = -13.04%