-6.19% is the change from 630 to 591
Calculation steps:
[( 591 - 630 ) ÷ 630] x 100 = -6.19%
Formula
Percentage change = [(591 - 630) / 630] x 100
Subtract the new number by the original number
591 - 630 = -39
-39 ÷ 630 = -0.06190476190476191
-0.06190476190476191 x 100 = -6.19%