-81.03% is the change from 817 to 155
Calculation steps:
[( 155 - 817 ) ÷ 817] x 100 = -81.03%
Formula
Percentage change = [(155 - 817) / 817] x 100
Subtract the new number by the original number
155 - 817 = -662
-662 ÷ 817 = -0.8102815177478581
-0.8102815177478581 x 100 = -81.03%