-33.3% is the change from 931 to 621
Calculation steps:
[( 621 - 931 ) ÷ 931] x 100 = -33.3%
Formula
Percentage change = [(621 - 931) / 931] x 100
Subtract the new number by the original number
621 - 931 = -310
-310 ÷ 931 = -0.33297529538131043
-0.33297529538131043 x 100 = -33.3%