-10.05% is the change from 189 to 170
Calculation steps:
[( 170 - 189 ) ÷ 189] x 100 = -10.05%
Formula
Percentage change = [(170 - 189) / 189] x 100
Subtract the new number by the original number
170 - 189 = -19
-19 ÷ 189 = -0.10052910052910052
-0.10052910052910052 x 100 = -10.05%