-81.15% is the change from 817 to 154
Calculation steps:
[( 154 - 817 ) ÷ 817] x 100 = -81.15%
Formula
Percentage change = [(154 - 817) / 817] x 100
Subtract the new number by the original number
154 - 817 = -663
-663 ÷ 817 = -0.8115055079559363
-0.8115055079559363 x 100 = -81.15%