-76.61% is the change from 171 to 40
Calculation steps:
[( 40 - 171 ) ÷ 171] x 100 = -76.61%
Formula
Percentage change = [(40 - 171) / 171] x 100
Subtract the new number by the original number
40 - 171 = -131
-131 ÷ 171 = -0.7660818713450293
-0.7660818713450293 x 100 = -76.61%