-50.15% is the change from 666 to 332
Calculation steps:
[( 332 - 666 ) ÷ 666] x 100 = -50.15%
Formula
Percentage change = [(332 - 666) / 666] x 100
Subtract the new number by the original number
332 - 666 = -334
-334 ÷ 666 = -0.5015015015015015
-0.5015015015015015 x 100 = -50.15%