-50.36% is the change from 687 to 341
Calculation steps:
[( 341 - 687 ) ÷ 687] x 100 = -50.36%
Formula
Percentage change = [(341 - 687) / 687] x 100
Subtract the new number by the original number
341 - 687 = -346
-346 ÷ 687 = -0.5036390101892285
-0.5036390101892285 x 100 = -50.36%