-32.91% is the change from 939 to 630
Calculation steps:
[( 630 - 939 ) ÷ 939] x 100 = -32.91%
Formula
Percentage change = [(630 - 939) / 939] x 100
Subtract the new number by the original number
630 - 939 = -309
-309 ÷ 939 = -0.329073482428115
-0.329073482428115 x 100 = -32.91%