-33.78% is the change from 974 to 645
Calculation steps:
[( 645 - 974 ) ÷ 974] x 100 = -33.78%
Formula
Percentage change = [(645 - 974) / 974] x 100
Subtract the new number by the original number
645 - 974 = -329
-329 ÷ 974 = -0.337782340862423
-0.337782340862423 x 100 = -33.78%