-50.37% is the change from 677 to 336
Calculation steps:
[( 336 - 677 ) ÷ 677] x 100 = -50.37%
Formula
Percentage change = [(336 - 677) / 677] x 100
Subtract the new number by the original number
336 - 677 = -341
-341 ÷ 677 = -0.5036927621861153
-0.5036927621861153 x 100 = -50.37%