-20.37% is the change from 643 to 512
Calculation steps:
[( 512 - 643 ) ÷ 643] x 100 = -20.37%
Formula
Percentage change = [(512 - 643) / 643] x 100
Subtract the new number by the original number
512 - 643 = -131
-131 ÷ 643 = -0.20373250388802489
-0.20373250388802489 x 100 = -20.37%