-9.98% is the change from 641 to 577
Calculation steps:
[( 577 - 641 ) ÷ 641] x 100 = -9.98%
Formula
Percentage change = [(577 - 641) / 641] x 100
Subtract the new number by the original number
577 - 641 = -64
-64 ÷ 641 = -0.0998439937597504
-0.0998439937597504 x 100 = -9.98%