-83.35% is the change from 817 to 136
Calculation steps:
[( 136 - 817 ) ÷ 817] x 100 = -83.35%
Formula
Percentage change = [(136 - 817) / 817] x 100
Subtract the new number by the original number
136 - 817 = -681
-681 ÷ 817 = -0.8335373317013464
-0.8335373317013464 x 100 = -83.35%