-92.17% is the change from 166 to 13
Calculation steps:
[( 13 - 166 ) ÷ 166] x 100 = -92.17%
Formula
Percentage change = [(13 - 166) / 166] x 100
Subtract the new number by the original number
13 - 166 = -153
-153 ÷ 166 = -0.9216867469879518
-0.9216867469879518 x 100 = -92.17%