-3.27% is the change from 643 to 622
Calculation steps:
[( 622 - 643 ) ÷ 643] x 100 = -3.27%
Formula
Percentage change = [(622 - 643) / 643] x 100
Subtract the new number by the original number
622 - 643 = -21
-21 ÷ 643 = -0.03265940902021773
-0.03265940902021773 x 100 = -3.27%