-8.08% is the change from 990 to 910
Calculation steps:
[( 910 - 990 ) ÷ 990] x 100 = -8.08%
Formula
Percentage change = [(910 - 990) / 990] x 100
Subtract the new number by the original number
910 - 990 = -80
-80 ÷ 990 = -0.08080808080808081
-0.08080808080808081 x 100 = -8.08%