-8.15% is the change from 675 to 620
Calculation steps:
[( 620 - 675 ) ÷ 675] x 100 = -8.15%
Formula
Percentage change = [(620 - 675) / 675] x 100
Subtract the new number by the original number
620 - 675 = -55
-55 ÷ 675 = -0.08148148148148149
-0.08148148148148149 x 100 = -8.15%