-35.92% is the change from 991 to 635
Calculation steps:
[( 635 - 991 ) ÷ 991] x 100 = -35.92%
Formula
Percentage change = [(635 - 991) / 991] x 100
Subtract the new number by the original number
635 - 991 = -356
-356 ÷ 991 = -0.35923309788092833
-0.35923309788092833 x 100 = -35.92%