-37.94% is the change from 630 to 391
Calculation steps:
[( 391 - 630 ) ÷ 630] x 100 = -37.94%
Formula
Percentage change = [(391 - 630) / 630] x 100
Subtract the new number by the original number
391 - 630 = -239
-239 ÷ 630 = -0.37936507936507935
-0.37936507936507935 x 100 = -37.94%