-30.17% is the change from 643 to 449
Calculation steps:
[( 449 - 643 ) ÷ 643] x 100 = -30.17%
Formula
Percentage change = [(449 - 643) / 643] x 100
Subtract the new number by the original number
449 - 643 = -194
-194 ÷ 643 = -0.30171073094867806
-0.30171073094867806 x 100 = -30.17%