-99.7% is the change from 991 to 3
Calculation steps:
[( 3 - 991 ) ÷ 991] x 100 = -99.7%
Formula
Percentage change = [(3 - 991) / 991] x 100
Subtract the new number by the original number
3 - 991 = -988
-988 ÷ 991 = -0.9969727547931383
-0.9969727547931383 x 100 = -99.7%