-48.06% is the change from 643 to 334
Calculation steps:
[( 334 - 643 ) ÷ 643] x 100 = -48.06%
Formula
Percentage change = [(334 - 643) / 643] x 100
Subtract the new number by the original number
334 - 643 = -309
-309 ÷ 643 = -0.48055987558320373
-0.48055987558320373 x 100 = -48.06%