-35.82% is the change from 991 to 636
Calculation steps:
[( 636 - 991 ) ÷ 991] x 100 = -35.82%
Formula
Percentage change = [(636 - 991) / 991] x 100
Subtract the new number by the original number
636 - 991 = -355
-355 ÷ 991 = -0.35822401614530774
-0.35822401614530774 x 100 = -35.82%