-90.88% is the change from 998 to 91
Calculation steps:
[( 91 - 998 ) ÷ 998] x 100 = -90.88%
Formula
Percentage change = [(91 - 998) / 998] x 100
Subtract the new number by the original number
91 - 998 = -907
-907 ÷ 998 = -0.908817635270541
-0.908817635270541 x 100 = -90.88%