-73.94% is the change from 637 to 166
Calculation steps:
[( 166 - 637 ) ÷ 637] x 100 = -73.94%
Formula
Percentage change = [(166 - 637) / 637] x 100
Subtract the new number by the original number
166 - 637 = -471
-471 ÷ 637 = -0.7394034536891679
-0.7394034536891679 x 100 = -73.94%