-9.76% is the change from 666 to 601
Calculation steps:
[( 601 - 666 ) ÷ 666] x 100 = -9.76%
Formula
Percentage change = [(601 - 666) / 666] x 100
Subtract the new number by the original number
601 - 666 = -65
-65 ÷ 666 = -0.09759759759759759
-0.09759759759759759 x 100 = -9.76%