-30.67% is the change from 939 to 651
Calculation steps:
[( 651 - 939 ) ÷ 939] x 100 = -30.67%
Formula
Percentage change = [(651 - 939) / 939] x 100
Subtract the new number by the original number
651 - 939 = -288
-288 ÷ 939 = -0.30670926517571884
-0.30670926517571884 x 100 = -30.67%