-89.8% is the change from 990 to 101
Calculation steps:
[( 101 - 990 ) ÷ 990] x 100 = -89.8%
Formula
Percentage change = [(101 - 990) / 990] x 100
Subtract the new number by the original number
101 - 990 = -889
-889 ÷ 990 = -0.897979797979798
-0.897979797979798 x 100 = -89.8%