-62.33% is the change from 645 to 243
Calculation steps:
[( 243 - 645 ) ÷ 645] x 100 = -62.33%
Formula
Percentage change = [(243 - 645) / 645] x 100
Subtract the new number by the original number
243 - 645 = -402
-402 ÷ 645 = -0.6232558139534884
-0.6232558139534884 x 100 = -62.33%