-3.19% is the change from 658 to 637
Calculation steps:
[( 637 - 658 ) ÷ 658] x 100 = -3.19%
Formula
Percentage change = [(637 - 658) / 658] x 100
Subtract the new number by the original number
637 - 658 = -21
-21 ÷ 658 = -0.031914893617021274
-0.031914893617021274 x 100 = -3.19%