-66.19% is the change from 491 to 166
Calculation steps:
[( 166 - 491 ) ÷ 491] x 100 = -66.19%
Formula
Percentage change = [(166 - 491) / 491] x 100
Subtract the new number by the original number
166 - 491 = -325
-325 ÷ 491 = -0.6619144602851323
-0.6619144602851323 x 100 = -66.19%