-49.55% is the change from 666 to 336
Calculation steps:
[( 336 - 666 ) ÷ 666] x 100 = -49.55%
Formula
Percentage change = [(336 - 666) / 666] x 100
Subtract the new number by the original number
336 - 666 = -330
-330 ÷ 666 = -0.4954954954954955
-0.4954954954954955 x 100 = -49.55%