-19.97% is the change from 641 to 513
Calculation steps:
[( 513 - 641 ) ÷ 641] x 100 = -19.97%
Formula
Percentage change = [(513 - 641) / 641] x 100
Subtract the new number by the original number
513 - 641 = -128
-128 ÷ 641 = -0.1996879875195008
-0.1996879875195008 x 100 = -19.97%