-72.3% is the change from 621 to 172
Calculation steps:
[( 172 - 621 ) ÷ 621] x 100 = -72.3%
Formula
Percentage change = [(172 - 621) / 621] x 100
Subtract the new number by the original number
172 - 621 = -449
-449 ÷ 621 = -0.7230273752012882
-0.7230273752012882 x 100 = -72.3%