-46.32% is the change from 639 to 343
Calculation steps:
[( 343 - 639 ) ÷ 639] x 100 = -46.32%
Formula
Percentage change = [(343 - 639) / 639] x 100
Subtract the new number by the original number
343 - 639 = -296
-296 ÷ 639 = -0.46322378716744916
-0.46322378716744916 x 100 = -46.32%