-76.77% is the change from 990 to 230
Calculation steps:
[( 230 - 990 ) ÷ 990] x 100 = -76.77%
Formula
Percentage change = [(230 - 990) / 990] x 100
Subtract the new number by the original number
230 - 990 = -760
-760 ÷ 990 = -0.7676767676767676
-0.7676767676767676 x 100 = -76.77%