-71.07% is the change from 643 to 186
Calculation steps:
[( 186 - 643 ) ÷ 643] x 100 = -71.07%
Formula
Percentage change = [(186 - 643) / 643] x 100
Subtract the new number by the original number
186 - 643 = -457
-457 ÷ 643 = -0.7107309486780715
-0.7107309486780715 x 100 = -71.07%