-71.77% is the change from 666 to 188
Calculation steps:
[( 188 - 666 ) ÷ 666] x 100 = -71.77%
Formula
Percentage change = [(188 - 666) / 666] x 100
Subtract the new number by the original number
188 - 666 = -478
-478 ÷ 666 = -0.7177177177177178
-0.7177177177177178 x 100 = -71.77%