-72.75% is the change from 991 to 270
Calculation steps:
[( 270 - 991 ) ÷ 991] x 100 = -72.75%
Formula
Percentage change = [(270 - 991) / 991] x 100
Subtract the new number by the original number
270 - 991 = -721
-721 ÷ 991 = -0.727547931382442
-0.727547931382442 x 100 = -72.75%