-80.66% is the change from 817 to 158
Calculation steps:
[( 158 - 817 ) ÷ 817] x 100 = -80.66%
Formula
Percentage change = [(158 - 817) / 817] x 100
Subtract the new number by the original number
158 - 817 = -659
-659 ÷ 817 = -0.806609547123623
-0.806609547123623 x 100 = -80.66%