-66.52% is the change from 666 to 223
Calculation steps:
[( 223 - 666 ) ÷ 666] x 100 = -66.52%
Formula
Percentage change = [(223 - 666) / 666] x 100
Subtract the new number by the original number
223 - 666 = -443
-443 ÷ 666 = -0.6651651651651652
-0.6651651651651652 x 100 = -66.52%