-73.17% is the change from 641 to 172
Calculation steps:
[( 172 - 641 ) ÷ 641] x 100 = -73.17%
Formula
Percentage change = [(172 - 641) / 641] x 100
Subtract the new number by the original number
172 - 641 = -469
-469 ÷ 641 = -0.7316692667706708
-0.7316692667706708 x 100 = -73.17%