-30.6% is the change from 647 to 449
Calculation steps:
[( 449 - 647 ) ÷ 647] x 100 = -30.6%
Formula
Percentage change = [(449 - 647) / 647] x 100
Subtract the new number by the original number
449 - 647 = -198
-198 ÷ 647 = -0.30602782071097373
-0.30602782071097373 x 100 = -30.6%