-4.46% is the change from 650 to 621
Calculation steps:
[( 621 - 650 ) ÷ 650] x 100 = -4.46%
Formula
Percentage change = [(621 - 650) / 650] x 100
Subtract the new number by the original number
621 - 650 = -29
-29 ÷ 650 = -0.04461538461538461
-0.04461538461538461 x 100 = -4.46%