-9.31% is the change from 999 to 906
Calculation steps:
[( 906 - 999 ) ÷ 999] x 100 = -9.31%
Formula
Percentage change = [(906 - 999) / 999] x 100
Subtract the new number by the original number
906 - 999 = -93
-93 ÷ 999 = -0.09309309309309309
-0.09309309309309309 x 100 = -9.31%