-98.36% is the change from 917 to 15
Calculation steps:
[( 15 - 917 ) ÷ 917] x 100 = -98.36%
Formula
Percentage change = [(15 - 917) / 917] x 100
Subtract the new number by the original number
15 - 917 = -902
-902 ÷ 917 = -0.9836423118865867
-0.9836423118865867 x 100 = -98.36%