-19.34% is the change from 641 to 517
Calculation steps:
[( 517 - 641 ) ÷ 641] x 100 = -19.34%
Formula
Percentage change = [(517 - 641) / 641] x 100
Subtract the new number by the original number
517 - 641 = -124
-124 ÷ 641 = -0.1934477379095164
-0.1934477379095164 x 100 = -19.34%