-34.99% is the change from 643 to 418
Calculation steps:
[( 418 - 643 ) ÷ 643] x 100 = -34.99%
Formula
Percentage change = [(418 - 643) / 643] x 100
Subtract the new number by the original number
418 - 643 = -225
-225 ÷ 643 = -0.3499222395023328
-0.3499222395023328 x 100 = -34.99%