-67.96% is the change from 643 to 206
Calculation steps:
[( 206 - 643 ) ÷ 643] x 100 = -67.96%
Formula
Percentage change = [(206 - 643) / 643] x 100
Subtract the new number by the original number
206 - 643 = -437
-437 ÷ 643 = -0.6796267496111975
-0.6796267496111975 x 100 = -67.96%