-77.63% is the change from 666 to 149
Calculation steps:
[( 149 - 666 ) ÷ 666] x 100 = -77.63%
Formula
Percentage change = [(149 - 666) / 666] x 100
Subtract the new number by the original number
149 - 666 = -517
-517 ÷ 666 = -0.7762762762762763
-0.7762762762762763 x 100 = -77.63%