-12.67% is the change from 939 to 820
Calculation steps:
[( 820 - 939 ) ÷ 939] x 100 = -12.67%
Formula
Percentage change = [(820 - 939) / 939] x 100
Subtract the new number by the original number
820 - 939 = -119
-119 ÷ 939 = -0.12673056443024494
-0.12673056443024494 x 100 = -12.67%