-49.7% is the change from 674 to 339
Calculation steps:
[( 339 - 674 ) ÷ 674] x 100 = -49.7%
Formula
Percentage change = [(339 - 674) / 674] x 100
Subtract the new number by the original number
339 - 674 = -335
-335 ÷ 674 = -0.4970326409495549
-0.4970326409495549 x 100 = -49.7%