-27.83% is the change from 891 to 643
Calculation steps:
[( 643 - 891 ) ÷ 891] x 100 = -27.83%
Formula
Percentage change = [(643 - 891) / 891] x 100
Subtract the new number by the original number
643 - 891 = -248
-248 ÷ 891 = -0.2783389450056117
-0.2783389450056117 x 100 = -27.83%