-30.03% is the change from 919 to 643
Calculation steps:
[( 643 - 919 ) ÷ 919] x 100 = -30.03%
Formula
Percentage change = [(643 - 919) / 919] x 100
Subtract the new number by the original number
643 - 919 = -276
-276 ÷ 919 = -0.3003264417845484
-0.3003264417845484 x 100 = -30.03%