-3.2% is the change from 656 to 635
Calculation steps:
[( 635 - 656 ) ÷ 656] x 100 = -3.2%
Formula
Percentage change = [(635 - 656) / 656] x 100
Subtract the new number by the original number
635 - 656 = -21
-21 ÷ 656 = -0.03201219512195122
-0.03201219512195122 x 100 = -3.2%