-93.64% is the change from 991 to 63
Calculation steps:
[( 63 - 991 ) ÷ 991] x 100 = -93.64%
Formula
Percentage change = [(63 - 991) / 991] x 100
Subtract the new number by the original number
63 - 991 = -928
-928 ÷ 991 = -0.9364278506559032
-0.9364278506559032 x 100 = -93.64%