-3.23% is the change from 990 to 958
Calculation steps:
[( 958 - 990 ) ÷ 990] x 100 = -3.23%
Formula
Percentage change = [(958 - 990) / 990] x 100
Subtract the new number by the original number
958 - 990 = -32
-32 ÷ 990 = -0.03232323232323232
-0.03232323232323232 x 100 = -3.23%