-91.38% is the change from 917 to 79
Calculation steps:
[( 79 - 917 ) ÷ 917] x 100 = -91.38%
Formula
Percentage change = [(79 - 917) / 917] x 100
Subtract the new number by the original number
79 - 917 = -838
-838 ÷ 917 = -0.9138495092693566
-0.9138495092693566 x 100 = -91.38%