-78.53% is the change from 666 to 143
Calculation steps:
[( 143 - 666 ) ÷ 666] x 100 = -78.53%
Formula
Percentage change = [(143 - 666) / 666] x 100
Subtract the new number by the original number
143 - 666 = -523
-523 ÷ 666 = -0.7852852852852853
-0.7852852852852853 x 100 = -78.53%