-70.76% is the change from 643 to 188
Calculation steps:
[( 188 - 643 ) ÷ 643] x 100 = -70.76%
Formula
Percentage change = [(188 - 643) / 643] x 100
Subtract the new number by the original number
188 - 643 = -455
-455 ÷ 643 = -0.7076205287713841
-0.7076205287713841 x 100 = -70.76%