-29.5% is the change from 912 to 643
Calculation steps:
[( 643 - 912 ) ÷ 912] x 100 = -29.5%
Formula
Percentage change = [(643 - 912) / 912] x 100
Subtract the new number by the original number
643 - 912 = -269
-269 ÷ 912 = -0.2949561403508772
-0.2949561403508772 x 100 = -29.5%