-72.1% is the change from 620 to 173
Calculation steps:
[( 173 - 620 ) ÷ 620] x 100 = -72.1%
Formula
Percentage change = [(173 - 620) / 620] x 100
Subtract the new number by the original number
173 - 620 = -447
-447 ÷ 620 = -0.7209677419354839
-0.7209677419354839 x 100 = -72.1%