-98.28% is the change from 991 to 17
Calculation steps:
[( 17 - 991 ) ÷ 991] x 100 = -98.28%
Formula
Percentage change = [(17 - 991) / 991] x 100
Subtract the new number by the original number
17 - 991 = -974
-974 ÷ 991 = -0.9828456104944501
-0.9828456104944501 x 100 = -98.28%