99100% is the change from 1 to 992
Calculation steps:
[( 992 - 1 ) ÷ 1] x 100 = 99100%
Formula
Percentage change = [(992 - 1) / 1] x 100
Subtract the new number by the original number
992 - 1 = 991
991 ÷ 1 = 991
991 x 100 = 99100%
Example