-71.75% is the change from 991 to 280
Calculation steps:
[( 280 - 991 ) ÷ 991] x 100 = -71.75%
Formula
Percentage change = [(280 - 991) / 991] x 100
Subtract the new number by the original number
280 - 991 = -711
-711 ÷ 991 = -0.7174571140262361
-0.7174571140262361 x 100 = -71.75%