-72.65% is the change from 991 to 271
Calculation steps:
[( 271 - 991 ) ÷ 991] x 100 = -72.65%
Formula
Percentage change = [(271 - 991) / 991] x 100
Subtract the new number by the original number
271 - 991 = -720
-720 ÷ 991 = -0.7265388496468214
-0.7265388496468214 x 100 = -72.65%