-73.56% is the change from 643 to 170
Calculation steps:
[( 170 - 643 ) ÷ 643] x 100 = -73.56%
Formula
Percentage change = [(170 - 643) / 643] x 100
Subtract the new number by the original number
170 - 643 = -473
-473 ÷ 643 = -0.7356143079315708
-0.7356143079315708 x 100 = -73.56%