-24.77% is the change from 666 to 501
Calculation steps:
[( 501 - 666 ) ÷ 666] x 100 = -24.77%
Formula
Percentage change = [(501 - 666) / 666] x 100
Subtract the new number by the original number
501 - 666 = -165
-165 ÷ 666 = -0.24774774774774774
-0.24774774774774774 x 100 = -24.77%