-69.98% is the change from 643 to 193
Calculation steps:
[( 193 - 643 ) ÷ 643] x 100 = -69.98%
Formula
Percentage change = [(193 - 643) / 643] x 100
Subtract the new number by the original number
193 - 643 = -450
-450 ÷ 643 = -0.6998444790046656
-0.6998444790046656 x 100 = -69.98%