-3.75% is the change from 666 to 641
Calculation steps:
[( 641 - 666 ) ÷ 666] x 100 = -3.75%
Formula
Percentage change = [(641 - 666) / 666] x 100
Subtract the new number by the original number
641 - 666 = -25
-25 ÷ 666 = -0.03753753753753754
-0.03753753753753754 x 100 = -3.75%