991.21% is the change from 91 to 993
Calculation steps:
[( 993 - 91 ) ÷ 91] x 100 = 991.21%
Formula
Percentage change = [(993 - 91) / 91] x 100
Subtract the new number by the original number
993 - 91 = 902
902 ÷ 91 = 9.912087912087912
9.912087912087912 x 100 = 991.21%