-58.01% is the change from 643 to 270
Calculation steps:
[( 270 - 643 ) ÷ 643] x 100 = -58.01%
Formula
Percentage change = [(270 - 643) / 643] x 100
Subtract the new number by the original number
270 - 643 = -373
-373 ÷ 643 = -0.5800933125972006
-0.5800933125972006 x 100 = -58.01%