-0.64% is the change from 621 to 617
Calculation steps:
[( 617 - 621 ) ÷ 621] x 100 = -0.64%
Formula
Percentage change = [(617 - 621) / 621] x 100
Subtract the new number by the original number
617 - 621 = -4
-4 ÷ 621 = -0.00644122383252818
-0.00644122383252818 x 100 = -0.64%