-13.02% is the change from 645 to 561
Calculation steps:
[( 561 - 645 ) ÷ 645] x 100 = -13.02%
Formula
Percentage change = [(561 - 645) / 645] x 100
Subtract the new number by the original number
561 - 645 = -84
-84 ÷ 645 = -0.13023255813953488
-0.13023255813953488 x 100 = -13.02%