-21.75% is the change from 630 to 493
Calculation steps:
[( 493 - 630 ) ÷ 630] x 100 = -21.75%
Formula
Percentage change = [(493 - 630) / 630] x 100
Subtract the new number by the original number
493 - 630 = -137
-137 ÷ 630 = -0.21746031746031746
-0.21746031746031746 x 100 = -21.75%