-50.15% is the change from 668 to 333
Calculation steps:
[( 333 - 668 ) ÷ 668] x 100 = -50.15%
Formula
Percentage change = [(333 - 668) / 668] x 100
Subtract the new number by the original number
333 - 668 = -335
-335 ÷ 668 = -0.5014970059880239
-0.5014970059880239 x 100 = -50.15%