-65.17% is the change from 491 to 171
Calculation steps:
[( 171 - 491 ) ÷ 491] x 100 = -65.17%
Formula
Percentage change = [(171 - 491) / 491] x 100
Subtract the new number by the original number
171 - 491 = -320
-320 ÷ 491 = -0.6517311608961304
-0.6517311608961304 x 100 = -65.17%