-19.75% is the change from 643 to 516
Calculation steps:
[( 516 - 643 ) ÷ 643] x 100 = -19.75%
Formula
Percentage change = [(516 - 643) / 643] x 100
Subtract the new number by the original number
516 - 643 = -127
-127 ÷ 643 = -0.19751166407465007
-0.19751166407465007 x 100 = -19.75%