-35% is the change from 980 to 637
Calculation steps:
[( 637 - 980 ) ÷ 980] x 100 = -35%
Formula
Percentage change = [(637 - 980) / 980] x 100
Subtract the new number by the original number
637 - 980 = -343
-343 ÷ 980 = -0.35
-0.35 x 100 = -35%
Example