-29.96% is the change from 918 to 643
Calculation steps:
[( 643 - 918 ) ÷ 918] x 100 = -29.96%
Formula
Percentage change = [(643 - 918) / 918] x 100
Subtract the new number by the original number
643 - 918 = -275
-275 ÷ 918 = -0.2995642701525055
-0.2995642701525055 x 100 = -29.96%