-22.45% is the change from 637 to 494
Calculation steps:
[( 494 - 637 ) ÷ 637] x 100 = -22.45%
Formula
Percentage change = [(494 - 637) / 637] x 100
Subtract the new number by the original number
494 - 637 = -143
-143 ÷ 637 = -0.22448979591836735
-0.22448979591836735 x 100 = -22.45%