-63.61% is the change from 643 to 234
Calculation steps:
[( 234 - 643 ) ÷ 643] x 100 = -63.61%
Formula
Percentage change = [(234 - 643) / 643] x 100
Subtract the new number by the original number
234 - 643 = -409
-409 ÷ 643 = -0.6360808709175739
-0.6360808709175739 x 100 = -63.61%