-31.08% is the change from 621 to 428
Calculation steps:
[( 428 - 621 ) ÷ 621] x 100 = -31.08%
Formula
Percentage change = [(428 - 621) / 621] x 100
Subtract the new number by the original number
428 - 621 = -193
-193 ÷ 621 = -0.3107890499194847
-0.3107890499194847 x 100 = -31.08%