-31.68% is the change from 666 to 455
Calculation steps:
[( 455 - 666 ) ÷ 666] x 100 = -31.68%
Formula
Percentage change = [(455 - 666) / 666] x 100
Subtract the new number by the original number
455 - 666 = -211
-211 ÷ 666 = -0.31681681681681684
-0.31681681681681684 x 100 = -31.68%