-89.81% is the change from 991 to 101
Calculation steps:
[( 101 - 991 ) ÷ 991] x 100 = -89.81%
Formula
Percentage change = [(101 - 991) / 991] x 100
Subtract the new number by the original number
101 - 991 = -890
-890 ÷ 991 = -0.8980827447023209
-0.8980827447023209 x 100 = -89.81%