-4.47% is the change from 649 to 620
Calculation steps:
[( 620 - 649 ) ÷ 649] x 100 = -4.47%
Formula
Percentage change = [(620 - 649) / 649] x 100
Subtract the new number by the original number
620 - 649 = -29
-29 ÷ 649 = -0.04468412942989214
-0.04468412942989214 x 100 = -4.47%