-74.4% is the change from 621 to 159
Calculation steps:
[( 159 - 621 ) ÷ 621] x 100 = -74.4%
Formula
Percentage change = [(159 - 621) / 621] x 100
Subtract the new number by the original number
159 - 621 = -462
-462 ÷ 621 = -0.7439613526570048
-0.7439613526570048 x 100 = -74.4%