-9.67% is the change from 641 to 579
Calculation steps:
[( 579 - 641 ) ÷ 641] x 100 = -9.67%
Formula
Percentage change = [(579 - 641) / 641] x 100
Subtract the new number by the original number
579 - 641 = -62
-62 ÷ 641 = -0.0967238689547582
-0.0967238689547582 x 100 = -9.67%