-33.86% is the change from 251 to 166
Calculation steps:
[( 166 - 251 ) ÷ 251] x 100 = -33.86%
Formula
Percentage change = [(166 - 251) / 251] x 100
Subtract the new number by the original number
166 - 251 = -85
-85 ÷ 251 = -0.3386454183266932
-0.3386454183266932 x 100 = -33.86%