-30.5% is the change from 646 to 449
Calculation steps:
[( 449 - 646 ) ÷ 646] x 100 = -30.5%
Formula
Percentage change = [(449 - 646) / 646] x 100
Subtract the new number by the original number
449 - 646 = -197
-197 ÷ 646 = -0.30495356037151705
-0.30495356037151705 x 100 = -30.5%