-21.39% is the change from 991 to 779
Calculation steps:
[( 779 - 991 ) ÷ 991] x 100 = -21.39%
Formula
Percentage change = [(779 - 991) / 991] x 100
Subtract the new number by the original number
779 - 991 = -212
-212 ÷ 991 = -0.21392532795156408
-0.21392532795156408 x 100 = -21.39%