-70.27% is the change from 666 to 198
Calculation steps:
[( 198 - 666 ) ÷ 666] x 100 = -70.27%
Formula
Percentage change = [(198 - 666) / 666] x 100
Subtract the new number by the original number
198 - 666 = -468
-468 ÷ 666 = -0.7027027027027027
-0.7027027027027027 x 100 = -70.27%