-73.25% is the change from 643 to 172
Calculation steps:
[( 172 - 643 ) ÷ 643] x 100 = -73.25%
Formula
Percentage change = [(172 - 643) / 643] x 100
Subtract the new number by the original number
172 - 643 = -471
-471 ÷ 643 = -0.7325038880248833
-0.7325038880248833 x 100 = -73.25%