-49.93% is the change from 671 to 336
Calculation steps:
[( 336 - 671 ) ÷ 671] x 100 = -49.93%
Formula
Percentage change = [(336 - 671) / 671] x 100
Subtract the new number by the original number
336 - 671 = -335
-335 ÷ 671 = -0.4992548435171386
-0.4992548435171386 x 100 = -49.93%