-9.21% is the change from 999 to 907
Calculation steps:
[( 907 - 999 ) ÷ 999] x 100 = -9.21%
Formula
Percentage change = [(907 - 999) / 999] x 100
Subtract the new number by the original number
907 - 999 = -92
-92 ÷ 999 = -0.0920920920920921
-0.0920920920920921 x 100 = -9.21%