-49.93% is the change from 687 to 344
Calculation steps:
[( 344 - 687 ) ÷ 687] x 100 = -49.93%
Formula
Percentage change = [(344 - 687) / 687] x 100
Subtract the new number by the original number
344 - 687 = -343
-343 ÷ 687 = -0.4992721979621543
-0.4992721979621543 x 100 = -49.93%