-34.45% is the change from 984 to 645
Calculation steps:
[( 645 - 984 ) ÷ 984] x 100 = -34.45%
Formula
Percentage change = [(645 - 984) / 984] x 100
Subtract the new number by the original number
645 - 984 = -339
-339 ÷ 984 = -0.3445121951219512
-0.3445121951219512 x 100 = -34.45%