-19.67% is the change from 798 to 641
Calculation steps:
[( 641 - 798 ) ÷ 798] x 100 = -19.67%
Formula
Percentage change = [(641 - 798) / 798] x 100
Subtract the new number by the original number
641 - 798 = -157
-157 ÷ 798 = -0.19674185463659147
-0.19674185463659147 x 100 = -19.67%