-97.07% is the change from 991 to 29
Calculation steps:
[( 29 - 991 ) ÷ 991] x 100 = -97.07%
Formula
Percentage change = [(29 - 991) / 991] x 100
Subtract the new number by the original number
29 - 991 = -962
-962 ÷ 991 = -0.970736629667003
-0.970736629667003 x 100 = -97.07%