-4.44% is the change from 90 to 86
Calculation steps:
[( 86 - 90 ) ÷ 90] x 100 = -4.44%
Formula
Percentage change = [(86 - 90) / 90] x 100
Subtract the new number by the original number
86 - 90 = -4
-4 ÷ 90 = -0.044444444444444446
-0.044444444444444446 x 100 = -4.44%