-13.1% is the change from 939 to 816
Calculation steps:
[( 816 - 939 ) ÷ 939] x 100 = -13.1%
Formula
Percentage change = [(816 - 939) / 939] x 100
Subtract the new number by the original number
816 - 939 = -123
-123 ÷ 939 = -0.13099041533546327
-0.13099041533546327 x 100 = -13.1%