-2.22% is the change from 90 to 88
Calculation steps:
[( 88 - 90 ) ÷ 90] x 100 = -2.22%
Formula
Percentage change = [(88 - 90) / 90] x 100
Subtract the new number by the original number
88 - 90 = -2
-2 ÷ 90 = -0.022222222222222223
-0.022222222222222223 x 100 = -2.22%