-12.75% is the change from 643 to 561
Calculation steps:
[( 561 - 643 ) ÷ 643] x 100 = -12.75%
Formula
Percentage change = [(561 - 643) / 643] x 100
Subtract the new number by the original number
561 - 643 = -82
-82 ÷ 643 = -0.12752721617418353
-0.12752721617418353 x 100 = -12.75%