-30.88% is the change from 991 to 685
Calculation steps:
[( 685 - 991 ) ÷ 991] x 100 = -30.88%
Formula
Percentage change = [(685 - 991) / 991] x 100
Subtract the new number by the original number
685 - 991 = -306
-306 ÷ 991 = -0.3087790110998991
-0.3087790110998991 x 100 = -30.88%