-61.9% is the change from 643 to 245
Calculation steps:
[( 245 - 643 ) ÷ 643] x 100 = -61.9%
Formula
Percentage change = [(245 - 643) / 643] x 100
Subtract the new number by the original number
245 - 643 = -398
-398 ÷ 643 = -0.6189735614307932
-0.6189735614307932 x 100 = -61.9%