-21.9% is the change from 630 to 492
Calculation steps:
[( 492 - 630 ) ÷ 630] x 100 = -21.9%
Formula
Percentage change = [(492 - 630) / 630] x 100
Subtract the new number by the original number
492 - 630 = -138
-138 ÷ 630 = -0.21904761904761905
-0.21904761904761905 x 100 = -21.9%