-91.28% is the change from 917 to 80
Calculation steps:
[( 80 - 917 ) ÷ 917] x 100 = -91.28%
Formula
Percentage change = [(80 - 917) / 917] x 100
Subtract the new number by the original number
80 - 917 = -837
-837 ÷ 917 = -0.9127589967284624
-0.9127589967284624 x 100 = -91.28%