-31.85% is the change from 449 to 306
Calculation steps:
[( 306 - 449 ) ÷ 449] x 100 = -31.85%
Formula
Percentage change = [(306 - 449) / 449] x 100
Subtract the new number by the original number
306 - 449 = -143
-143 ÷ 449 = -0.3184855233853007
-0.3184855233853007 x 100 = -31.85%