-20.77% is the change from 621 to 492
Calculation steps:
[( 492 - 621 ) ÷ 621] x 100 = -20.77%
Formula
Percentage change = [(492 - 621) / 621] x 100
Subtract the new number by the original number
492 - 621 = -129
-129 ÷ 621 = -0.20772946859903382
-0.20772946859903382 x 100 = -20.77%