-34.38% is the change from 983 to 645
Calculation steps:
[( 645 - 983 ) ÷ 983] x 100 = -34.38%
Formula
Percentage change = [(645 - 983) / 983] x 100
Subtract the new number by the original number
645 - 983 = -338
-338 ÷ 983 = -0.34384537131230924
-0.34384537131230924 x 100 = -34.38%