-3.37% is the change from 89 to 86
Calculation steps:
[( 86 - 89 ) ÷ 89] x 100 = -3.37%
Formula
Percentage change = [(86 - 89) / 89] x 100
Subtract the new number by the original number
86 - 89 = -3
-3 ÷ 89 = -0.033707865168539325
-0.033707865168539325 x 100 = -3.37%