-29.8% is the change from 916 to 643
Calculation steps:
[( 643 - 916 ) ÷ 916] x 100 = -29.8%
Formula
Percentage change = [(643 - 916) / 916] x 100
Subtract the new number by the original number
643 - 916 = -273
-273 ÷ 916 = -0.2980349344978166
-0.2980349344978166 x 100 = -29.8%