-90.62% is the change from 991 to 93
Calculation steps:
[( 93 - 991 ) ÷ 991] x 100 = -90.62%
Formula
Percentage change = [(93 - 991) / 991] x 100
Subtract the new number by the original number
93 - 991 = -898
-898 ÷ 991 = -0.9061553985872856
-0.9061553985872856 x 100 = -90.62%