-68.43% is the change from 491 to 155
Calculation steps:
[( 155 - 491 ) ÷ 491] x 100 = -68.43%
Formula
Percentage change = [(155 - 491) / 491] x 100
Subtract the new number by the original number
155 - 491 = -336
-336 ÷ 491 = -0.6843177189409368
-0.6843177189409368 x 100 = -68.43%