-22.9% is the change from 834 to 643
Calculation steps:
[( 643 - 834 ) ÷ 834] x 100 = -22.9%
Formula
Percentage change = [(643 - 834) / 834] x 100
Subtract the new number by the original number
643 - 834 = -191
-191 ÷ 834 = -0.2290167865707434
-0.2290167865707434 x 100 = -22.9%