-73.07% is the change from 635 to 171
Calculation steps:
[( 171 - 635 ) ÷ 635] x 100 = -73.07%
Formula
Percentage change = [(171 - 635) / 635] x 100
Subtract the new number by the original number
171 - 635 = -464
-464 ÷ 635 = -0.7307086614173228
-0.7307086614173228 x 100 = -73.07%