-21.35% is the change from 89 to 70
Calculation steps:
[( 70 - 89 ) ÷ 89] x 100 = -21.35%
Formula
Percentage change = [(70 - 89) / 89] x 100
Subtract the new number by the original number
70 - 89 = -19
-19 ÷ 89 = -0.21348314606741572
-0.21348314606741572 x 100 = -21.35%