-73% is the change from 637 to 172
Calculation steps:
[( 172 - 637 ) ÷ 637] x 100 = -73%
Formula
Percentage change = [(172 - 637) / 637] x 100
Subtract the new number by the original number
172 - 637 = -465
-465 ÷ 637 = -0.7299843014128728
-0.7299843014128728 x 100 = -73%