-32.24% is the change from 949 to 643
Calculation steps:
[( 643 - 949 ) ÷ 949] x 100 = -32.24%
Formula
Percentage change = [(643 - 949) / 949] x 100
Subtract the new number by the original number
643 - 949 = -306
-306 ÷ 949 = -0.3224446786090622
-0.3224446786090622 x 100 = -32.24%