-73.37% is the change from 646 to 172
Calculation steps:
[( 172 - 646 ) ÷ 646] x 100 = -73.37%
Formula
Percentage change = [(172 - 646) / 646] x 100
Subtract the new number by the original number
172 - 646 = -474
-474 ÷ 646 = -0.7337461300309598
-0.7337461300309598 x 100 = -73.37%