-86.47% is the change from 170 to 23
Calculation steps:
[( 23 - 170 ) ÷ 170] x 100 = -86.47%
Formula
Percentage change = [(23 - 170) / 170] x 100
Subtract the new number by the original number
23 - 170 = -147
-147 ÷ 170 = -0.8647058823529412
-0.8647058823529412 x 100 = -86.47%