-52.25% is the change from 666 to 318
Calculation steps:
[( 318 - 666 ) ÷ 666] x 100 = -52.25%
Formula
Percentage change = [(318 - 666) / 666] x 100
Subtract the new number by the original number
318 - 666 = -348
-348 ÷ 666 = -0.5225225225225225
-0.5225225225225225 x 100 = -52.25%